SQL Server 2008 Tutorial

SQL Server 2008 Tutorial

     This SQL Server tutorial is for anyone who wants to learn how to use SQL Server 2008. It assumes a basic understanding of databases and how they work.

If you don't currently have an understanding of how databases work, start with the basic database tutorial first.   That tutorial covers the basic concepts of databases, so the examples in this tutorial will make more sense once you return here.

To get the most out of this tutorial, you should have a copy of SQL Server installed on your computer, so that you can go through the examples yourself. The examples in this tutorial are all done using the free version of SQL Server - SQL Server 2008 Express. You can download SQL Server 2008 Express from the Microsoft website (we'll get to that in a minute).

If you don't currently have SQL Server yet, that's OK. The tutorial is straight forward and contains plenty of screenshots.

Table of Contents

This tutorial consists of the following lessons: About SQL Server SQL Server Editions SQL Server - Management Studio SQL Server - Create a Database SQL Server - Create a Table SQL Server - Adding Data SQL Server - Query Designer SQL Server Views SQL Server Stored Procedures User Logins Server Roles Database Schemas Linked Servers Integration Services Summary 1. About SQL Server      Microsoft SQL Server is a Relational Database Management System (RDBMS) designed to run on platforms ranging from laptops to large multiprocessor servers. SQL Server is commonly used as the backend system for websites and corporate CRMs and can support thousands of concurrent users. SQL Server comes with a number of tools to help you with your database administration and programming tasks. SQL Server is much more robust and scalable than a desktop database management system such as Microsoft Access. Anyone who has ever tried using Access as a backend to a website will probably be familiar with the errors that were generated when too many users tried to access the database! Although SQL Server can also be run as a desktop database system, it is most commonly used as a server database system. Server Database Systems      Server based database systems are designed to run on a central server, so that multiple users can access the same data simultaneously. The users normally access the database through an application. For example, a website could store all its content in a database. Whenever a visitor views an article, they are retrieving data from the database. As you know, websites aren't normally limited to just one user. So, at any given moment, a website could be serving up hundreds, or even thousands of articles to its website visitors. At the same time, other users could be updating their personal profile in the members' area, or subscribing to a newsletter, or anything else that website users do. Generally, it's the application that provides the functionality to these visitors. It is the database that stores the data and makes it available. Having said that, SQL Server does include some useful features that can assist the application in providing its functionality. SQL Server Editions SQL Server comes in many editions. Some are paid versions others are free. The examples in this tutorial were done using the free Express version of SQL Server. The next lesson discusses the various editions of SQL Server 2008. 2. SQL Server 2008 Editions If you are serious about installing (or upgrading) SQL Server, this page provides a quick overview of your options. SQL Server 2008 comes in many different editions. The edition you choose will depend on your requirements. If you are looking for a free database management system, you will need to choose one of the Express editions or the Compact edition. You could also try the Evaluation edition, which allows you to trial SQL Server 2008 for 180 days. The Editions Here are the different editions available for SQL Server 2008. Enterprise Edition Data management and business intelligence platform providing enterprise class scalability, high availability, and security for running business-critical applications Standard Edition Data management and business intelligence platform providing ease of use and manageability for running departmental applications Workgroup Edition Data management and reporting platform providing secure, remote synchronization, and management capabilities for running branch applications Developer Edition May be installed and used by one user to design, develop, test, and demonstrate your programs on as many systems as needed Web Edition A low-TCO, scalable, and manageable database option for web hosters and end customers looking to deploy publicly facing web applications and services Express Edition A free edition of SQL Server ideal for learning and building desktop and small server applications and for redistribution by ISVs Compact Edition A free, SQL Server embedded database ideal for building stand-alone and occasionally connected applications for mobile devices, desktops, and web clients Evaluation Edition This edition may be installed for demonstration and evaluation purposes until an expiration period of 180 days. SQL Server Edition in this Tutorial The examples in this tutorial were made using the (free) Express edition of SQL Server 2008. To be more precise, it is SQL Server 2008 Express with Advanced Services. SQL Server 2008 Express with Advanced Services includes the following features: SQL Server database engine - create, store, update and retrieve your data SQL Server Management Studio Basic - visual database management tool for creating, editing and managing databases Full-text Search - powerful, high-speed engine for searching text-intensive data Reporting Services - integrated report creation and design environment to create reports The Express edition also comes as SQL Server 2008 Express with Tools, which only includes the SQL Server database engine and the SQL Server Management Studio Basic, and SQL Server 2008 Express (Runtime Only) which doesn't include the SQL Server Management Studio. While the free version of SQL Server does have its limitations, it is a good start for those starting out with SQL Server. You can download SQL Server 2008 Express from Microsoft's website. 3. SQL Server Management Studio (SSMS) SQL Server Management Studio (SSMS) is the main administration console for SQL Server. SSMS enables you to create database objects (such as databases, tables, views etc), view the data within your database, you can configure user accounts, transfer data between databases, and more. Here's what SQL Server Management Studio looks like when you first open it up: The left pane contains the Object Explorer. The Object Explorer provides navigation to databases, server objects (such as triggers), log files, and more. The right pane allows you to write queries against the database and view the results. In this screenshot I have opened a blank query by clicking the "New Query" button. You can also bring up other windows, such as the Properties window. Note that I have minimized the size of the window for this screenshot. Once maximized, you have much more room to play with. You can use SQL Server Management Studio to create as many databases as you like. You can also connect to as many databases on as many servers as you like. Most of the tasks performed with SQL Server Management Studio are initiated either from the top menu, or by right-clicking on an icon/object. Throughout most of this tutorial, we'll be looking at the various things you can do via SQL Server Management Studio. 4. SQL Server - Create a Database One of the first things we should look at with SQL Server/Management Studio is how to create a database. After all, most of the tasks you perform with SQL Server will evolve around one or more databases. System Databases If you've only just installed SQL Server, you might notice that some databases have already been created. These are system databases. Database Type Description master System database Stores system level information such as user accounts, configuration settings, and info on all other databases. model System database This database is used as a template for all other databases that are created. msdb System database Used by the SQL Server Agent for configuring alerts and scheduled jobs etc tempdb System database Holds all temporary tables, temporary stored procedures, and any other temporary storage requirements generated by SQL Server. We will now create another database for our own use. Creating a New Database The following steps demonstrate how to create a database in SQL Server using SQL Server Management Studio. Right click on the "Databases" icon and select "New Database...": Name your database and click "OK": Your New Database You will now notice your new database appears under the "Databases" section of SQL Server Management Studio. Your new database is based on the "Model" database. The Model database is a system database which is used as a template whenever a new database is created. If you use the left pane to navigate to your database and expand the tree, you will notice that your database already contains a number of objects. For example, it already contains system functions, system views, system stored procedures, and (hidden) system tables. These are system objects which provide information about the database. Other Options We have just created a database using the default options. When we created the database, a "Data File" and a "Transaction Log" were created. They were created in the default location for our server. If we'd wanted to, we could have specified a different location for these files. We also could have changed specifications on whether to allow the file to grow automatically (as it stores more and more data), and if so, how that growth should be managed. We could have done that at step 2. But all is not lost. We can still do it now that we've created the database. We can do it via the Properties dialog box. To view or change the database properties, simply right click on the database and select "Properties": The Properties dialog contains a large number of options for changing the configuration of your database. For now, we can leave everything at its default setting. 5. SQL Server - Create a Table This lesson demonstrates how to create a table in a SQL Server database using SQL Server Management Studio (SSMS). Ensuring you have the right database expanded, right click on the "Tables" icon and select "New Table...": While you have this screen open, do the following: Using the values in the screenshot, complete the details in the "Column Name" column, the "Data Type" column, "Length" column, and "Allow Nulls" column. Make the IndividualId column an "identity column", by setting "Is Identity" to "Yes" (this option is under the "Identity Specification" section in the bottom pane). Note that to set values in the bottom pane, you need to select the column name in the top pane first). This column is going to be an auto-number column - it will contain an incrementing number for each record that is created. Set the "Default Value" of the DateCreated column to (getdate()). (This will automatically insert the current date into that field for each new record). What we are doing at this stage, is creating the column names, specifying the type of data that can be entered into them, and setting default values. Restricting the data type for each column is very important and helps maintain data integrity. For example, it can prevent us from accidentally entering an email address into a field for storing the current date. Save the table by selecting File > Save Table_1: When prompted, name your table: Your New Table Now that you've created a new table, it will appear under your database in the "Tables" section. 6. SQL Server - Adding Data In the previous lesson, we created a new table in our database. We now have a database table, columns and all, but with no data. Editing Table Rows We can use the "Edit Top 200 Rows" option to add data to our table. To use this option, right click on the table you wish to open, and select "Edit Top 200 Rows": You can now start entering the data directly into your table. Note that you don't need to enter data into the IndividualId and DateCreated columns. This is because the they will be populated automatically (remember, we set IndividualId to "Is Identity" and DateCreated to "GetDate()")) Disadvantages of Entering Data Directly to your Table The above method is fine if you only have a small amount of data to enter or update. If you have a lot of data to enter, this could become very tedious. Also, if you have multiple environments (for example, a development environment, staging environment, and production environment), with duplicate databases configured in each environment, you will need to re-enter the same data into each environment. When you're first learning SQL Server, this may not be a major concern. However, in an environment such as described, entering data directly into the table becomes quite inefficient. A Better Method - SQL Scripts In most cases, you will probably find it more efficient to write a SQL script. Using a script enables you to re-enter the data as many times as you like. If you need to rebuild your database for any reason, you can simply run your script to enter the data. If you have multiple environments, once again you can run your script against each environment. Once you get used to writing and running scripts, you will probably find it quicker than entering data directly into the table. Database Driven Websites When you create a database driven website, you actually write SQL scripts to insert data into the database. You also use SQL scripts to read data, update data, and delete data. These SQL scripts can be placed directly into your website code (PHP, ColdFusion etc), or they can be stored in the database as Stored Procedures or Views. In the next lesson, we will look at how to write and execute SQL scripts within SQL Server. SQL Server - SQL Scripts In the previous lesson, we added data to our database table using the "Edit Top 200 Rows" option. In this lesson, we will look at how to write SQL scripts to update and run queries against our database. Create a New Query Before we generate our SQL script, we need somewhere to enter it into. This part is easy. Just click the "New Query" button: A blank, white sheet should now appear on the right pane. Write/Run Your SQL Script You are now ready to write SQL queries against your database. You can use this interface to create database objects (such as databases, tables, views etc), insert data into a database table, select data, update data, delete data. To run an SQL query: Type your query into the workspace on the right pane Click "Execute" (you can also press F5) The following screenshot shows an example of using a SQL 'select' statement to select data from a database: As you can see, the results of the query are displayed in the bottom pane. As a shortcut, you can click on a table in the left pane and drag it to the right pane when building your query. This can save you time - especially if you have many tables to add to your query. The above 'select' statement is an example of a SQL query. Apart from the occasional example, SQL queries are outside the scope of this tutorial. If you'd like to learn more about writing SQL queries, check out theSQL tutorial. Database Administration Tasks Most of the database administration tasks that can be performed in SSMS via the graphical user interface can be performed programatically via SQL scripts. This tutorial concentrates on using the graphical user interface, mainly because it's usually a lot easier for new users to get their head around. Once you become more familiar with SQL Server, you may find yourself using SQL scripts to perform many of the tasks that you started out doing via the graphical user interface. 7. SQL Server - Query Designer In the previous lesson, we created a SQL script using SQL Server Management Studio (SSMS). In this lesson, we will look at how to write SQL scripts using the graphical query designer. About The Query Designer The graphical query designer is a graphical user interface that allows you to build queries to run against your SQL Server database. This can be particularly useful when building complex queries that involves many tables, views etc. The query designer can also be beneficial for those who are learning how to write SQL. This is because you don't need to remember the SQL syntax in order to write queries against your database - the query designer generates the SQL for you. Building Your Queries To build a query with the query designer: Select Query > Design Query in Editor...: Add the tables you want to run the query against. In this case, we only have one table to choose from. Select the column/s you want to display in your query: Click "OK" Once you've clicked OK, you will find the query has been added to your workspace. You can then run it as you would any other query. 8. SQL Server - Views In SQL Server, a view is a pre-written query that is stored on the database. A view consists of a SELECT statement, and when you run the view, you see the results of it like you would when opening a table. Some people like to think of a view as a virtual table. This is because a view can pull together data from multiple tables, as well as aggregate data, and present it as though it is a single table. Benefits of Views A view can be useful when there are multiple users with different levels of access, who all need to see portions of the data in the database (but not necessarily all of the data). Views can do the following: Restrict access to specific rows in a table Restrict access to specific columns in a table Join columns from multiple tables and present them as though they are part of a single table Present aggregate information (such as the results of the COUNT function) Accessing Views Any view that you create ends up being located under the "Views" folder of your database. The following screenshot shows a number of views that are located within the "AdventureWorks2008" database: Creating a View You create a view by using the CREATE VIEW statement, followed by the SELECT statement. Code Example: Code Modifing a View You can modify an existing view by using using ALTER instead or CREATE. Example: Code You can also right click on the view and select "Design". Running a View You run a view by using a SELECT statement. Code You can also right-click on the view and select "Select Top 1000 Rows". Running the above view results in this: As you can see, it looks just like you've selected rows from a table. The difference is that, each column could potentially be coming from a different table. 9. SQL Server - Stored Procedures Stored procedures are a powerful part of SQL Server. They can assist programmers and administrators greatly in working with the database configuration and its data. A stored procedure is a precompiled group of Transact-SQL statements, and is saved to the database (under the "Stored Procedures" node). Programmers and administrators can execute stored procedures either from the SQL Server Management Studio or from within an application as required. Transact-SQL, which is based on SQL (Structured Query Language), is the programming language used to interface between applications and their databases. Transact-SQL is a relatively easy language to learn and I highly recommend becoming familiar with it. Benefits of Stored Procedures Here are some key benefits in using stored procedures: Benefit Explanation of benefit Modular programming You can write a stored procedure once, then call it from multiple places in your application. Performance Stored procedures provide faster code execution and reduce network traffic. Faster execution: Stored procedures are parsed and optimized as soon as they are created and the stored procedure is stored in memory. This means that it will execute a lot faster than sending many lines of SQL code from your application to the SQL Server. Doing that requires SQL Server to compile and optimze your SQL code every time it runs. Reduced network traffic: If you send many lines of SQL code over the network to your SQL Server, this will impact on network performance. This is especially true if you have hundreds of lines of SQL code and/or you have lots of activity on your application. Running the code on the SQL Server (as a stored procedure) eliminates the need to send this code over the network. The only network traffic will be the parameters supplied and the results of any query. Security Users can execute a stored procedure without needing to execute any of the statements directly. Therefore, a stored procedure can provide advanced database functionality for users who wouldn't normally have access to these tasks, but this functionality is made available in a tightly controlled way. Creating a Stored Procedure You create stored procedures in the SQL Server Management Studio using the CREATE PROCEDUREstatement, followed by the code that makes up the stored procedure. Code The following code creates a stored procedure called "MyStoredProcedure": Code Once you run this code in the SQL Server Management Studio, the stored procedure is created and appears under the "Stored Procedures" node. Modifying a Stored Procedure If you need to modify an existing stored procedure, you simply replace the CREATE with ALTER. Code Running a Stored Procedure You can run a stored procedure by using EXECUTE or EXEC. For example, to run the above stored procedure, type the following: Code If the stored procedure has spaces in its name, enclose it between double quotes: Code If your stored procedure accepts any parameters, they are placed after the procedure name: Code So, here's an example: Code Using The GUI You can also use the graphical user interface to initiate the execution of a stored procedure. To initiate a stored procedure this way: Navigate to the stored procedure Right click on the stored procedure and select "Execute Stored Procedure...": A dialog will appear. Enter your chosen parameter values etc: Click "OK" SQL Server will now generate the SQL code and execute the stored procedure: Parameters A parameter is a value that your stored procedure uses in order to perform it's task. When you write a stored procedure, you can specify the parameters that need to be supplied from the user. For example, if you write a stored procedure to select the address details about an individual, your stored procedure needs to know which individual to select. In this case, the user can provide an IndividualId or UserId to tell the stored procedure which individual to look up. System Stored Procedures SQL Server includes a large number of system stored procedures to assist in database administration tasks. Many of the tasks you can perform via SQL Server Management Studio can be done via a system stored procedure. For example, some of the things you can do with system stored procedures include: configure security accounts set up linked servers create a database maintenance plan create full text search catalogs configure replication set up scheduled jobs and much more.

10. SQL Server - User Logins

SQL Server allows for the creation of user logins. Each individual who needs access to SQL Server can be given their own user account.

When the administrator configures these user logins, he/she can assign them to any number of roles and schemas, depending on the access that the individual is entitled to.

In this lesson, we will walk through the steps in creating a user login.

To Create a New User Login

1. Using SQL Server Management Studio, expand the "Security" option and right click on "Logins"
2. Click on "New Login"
   
3. Complete the login properties in the "General" tab by providing a name for the login, choosing the Authentication method (providing a password if you choose "SQL Server authentication"), and selecting the database to use as a default. If you don't choose a language, it will use the default for the current installation of SQL Server.
   If you get an error that reads "The MUST_CHANGE option is not supported by this version of Microsoft Windows", simply uncheck the "User must change password at next login" option. The error occurs because your operating system doesn't support this option.
   
   
   
4. Click the "Server Roles" tab if you need to apply any server-wide security privileges.
   
5. Click the "User Mapping" tab to specify which databases this user account is allowed to access. By default, the login will be assigned to the "Public" role, which provides the login with basic access. If the login needs more access in one or more databases, it can be assigned to another role with greater privileges.
   Note that these roles are "Database Roles" and are different to the server roles in the previous tab. Server roles are for administering the SQL Server. Database roles are created within each database and specify what the login can do within that database.
   

11. SQL Server - Server Roles

When creating a new user login in SQL Server, you get the option of assigning the login one or more server roles.

Server roles (not to be confused with database roles) are available for various database administration tasks. Not everyone should be assigned to a server role. In fact, only advanced users such as database administrators should be assigned a server role.

Accessing the Server Roles

To access the server roles in SQL Server Management Studio, expand the Security folder:

You view the properties of a server role by right clicking on it. You can then add users to the server role by clicking Add. In the screenshot below, Homer has been added to the securityadmin role.

Explanation of Server Roles

Here's an explanation of the server roles defined in SQL Server 2008 during setup:

Server Role	Description
sysadmin	Can perform any task in SQL Server.
serveradmin	Can set server-wide configuration options, can shut down the server.
setupadmin	Can manage linked servers and startup procedures.
securityadmin	Can manage logins and database permissions, read logs, change passwords.
processadmin	Can manage processes running in SQL Server.
dbcreator	Can create, alter, and drop databases.
diskadmin	Can manage disk files.
bulkadmin	Can execute BULK INSERT statements.
public	Every SQL Server user account belongs to this server role. When a server principal has not been granted or denied specific permissions on a securable object, the user inherits the permissions granted to public on that object. Only assign public permissions on an object when you want the object to be available to all users.

As you can see, some of these roles allow very specific tasks to be performed. If you don't have many technical users, it's likely that you'll only use one or two of these roles (including sysadmin).

12. SQL Server - Database Schemas

Ever since SQL Server 2005 was released, each object in a database has belonged to a database schema. SQL Server 2008 has continued with database schemas, and an explanation follows.

What is a Database Schema?

A database schema is a way to logically group objects such as tables, views, stored procedures etc. Think of a schema as a container of objects.

You can assign a user login permissions to a single schema so that the user can only access the objects they are authorized to access.

Schemas can be created and altered in a database, and users can be granted access to a schema. A schema can be owned by any user, and schema ownership is transferable.

Creating a Database Schema

To create a database schema in SQL Server 2008:

1. Navigate to Security > Schemas
2. Right click on Schemas and select New Schema.... Like this:
   
3. Complete the details in the General tab for the new schema. In this example, the schema name is "person" and the schema owner is "Homer".
   
4. Add users to the schema as required and set their permissions:
   
5. Add any extended properties (via the Extended Properties tab)
6. Click OK.

Add a Table to the New Schema

Now that we have a new schema, we can add objects such as tables, views, and stored procedures to it. For example, we could transfer the table that we created in the earlier lesson to the new schema.

When we created that table (called "Individual"), it was created in the default database schema ("dbo"). We know this because it appears in our object browser as "dbo.Individual".

To transfer the "Individual" table to the person "schema":

1. In Object Explorer, right click on the table name and select "Design":
   
2. From Design view, press F4 to display the Properties window.
3. From the Properties window, change the schema to the desired schema:
   
4. Close Design View by right clicking the tab and selecting "Close":
   
5. Click "OK" when prompted to save

Your table has now been transferred to the "person" schema.

Confirm your Change

To confirm the change:

1. Refresh the Object Browser view:
   
2. You will now see that Object Browser displays the new schema for the table (person.Individual):
   

If you've been navigating around SQL Server Management Studio (SSMS), you may have come across the Linked Servers option.

The Linked Servers option allows you to connect to another instance of SQL Server running on a different machine, perhaps remotely in a different city/country. This can be useful if you need to perform distributed queries (query a remote database). Setting up a linked server is quite straight forward in SSMS, all you need is details of the remote server, and the database that you need to query.

Creating a Linked Server

To create a linked server:

1. Navigate to Server Objects > Linked Servers
2. Right click on Linked Servers and select New Linked Server.... Like this:
   
3. Complete the details for the linked server. In this example, Data source refers to the name of the SQL Server machine ("Barts_database_server"), Catalogue refers to the name of the database ("Barts_database"). You can also configure options in the other two tabs depending on your requirements.
   

Distributed Queries

Once you have configured your linked server, you will be able to run queries etc against it. When you run a query against a linked server, it is referred to as a distributed query. When you execute a distributed query against a linked server, you must include a fully qualified, four-part table name for each data source to query. This four-part name should be in the formlinked_server_name.catalog.schema.object_name.

Here's an example:

Code

This example is based on the linked server example above. It assumes that the remote database has a schema called "Person" and a table called "Enemy".

14. SQL Server Integration Services (SSIS)

SQL Server Integration Services (SSIS) allows you to integrate smoothly with other applications and data sources.

You can use Integration Services to copy or download files, send e-mail messages in response to events, update data warehouses, clean and mine data, and manage SQL Server objects and data.

In SQL Server 2005 and higher, Data Transformation Services (DTS) is no longer installed with SQL Server. All DTS related tasks are now performed with SSIS.

Where Has DTS Gone?

If you have been working with earlier versions of SQL Server (SQL Server 2000 and earlier), you are probably familiar with DTS. DTS allowed you to transfer data between disparate sources into one or more destinations.

Well, starting from SQL Server 2005, DTS has been deprecated. DTS is no longer included with your SQL Server installation.

If you need DTS-type functionality in SQL Server 2008, you will need to use SQL Server Integration Services.

Backwards Compatibility

For backwards compatibility, Microsoft has provided installation files that provide run-time support for DTS packages. This will be useful if you have already created DTS packages in an earlier version of SQL Server. For more information see Support for Data Transformation Services (DTS) in SQL Server 2008 on the MSDN website.

SQL Server Express & SSIS

SQL Server Integration Services is not available in the Express or Workgroup editions of SQL Server. If you need to use Integration Services, you need at least SQL Server Standard edition. And, if you need to use advanced features (such as data mining, text mining and cleansing or fuzzy transforms), you will need SQL Server Enterprise edition.

For more information on SQL Server Integration Services, check out SQL Server Integration Services on the MSDN website.

15. SQL Server - Summary

Congratulations for reaching the end of this SQL Server tutorial!

SQL Server is a powerful application, and this tutorial has provided an overview of the main concepts involved in administering SQL Server 2008 Express.

To recap briefly, we've:

• Created databases
• Created database tables
• Inserted data into those tables
• Used the SSMS to run a query
• Created a login account
• Looked at server roles
• Learned about database schemas
• Looked at linked servers
• and more

What Next?

There were a couple of areas we didn't touch on during this tutorial. This is mainly due to the fact that it is aimed at the free SQL Server Express version, which has its limitations.

All is not lost though. My SQL Server 2000 tutorial covers some of the areas that weren't included here. For example, you can learn about the SQL Server Agent for scheduling jobs to run automatically. You can also read about the SQL Profiler, which allows you to monitor events within your SQL Server.

The most logical next step from learning SQL Server is to learn SQL itself (if you haven't already done this that is). SQL stands for Structured Query Language and enables you to perform database related tasks programatically. Most of the tasks in this tutorial can be done programatically using SQL.

Probably the most common use for SQL is to work with the data in the database. For example, to insert data, select data, update data, or to delete data. Any database driven website will have many SQL statements doing this stuff.

To learn more about SQL, check out the SQL tutorial.....