Join Simon Allardice for an in-depth discussion in this video Creating check constraints, part of SQL Server 2008 Essential Training.
Another way that we can increase the reliability, the integrity of our data, is…to apply what are called check constraints.…A check constraint is a simple idea.…If we have some data such as Quantity where we can look at that and understand…this really unacceptable range for this to be in,…even though this column is actually being defined as an int, we don't need all…that an int can give us.…Because an integer can support from roughly -2 billion to plus 2 billion,…it is quite unlikely that someone will order -2 billion quantities of a unit.…
So let's say I want to enforce some rules on this column that says Quantity must…be greater than 0 and less than 51 say.…Well, I do this by applying a check constraint to the table.…I am going to right-click anywhere in the Designer area.…It really doesn't matter. And I have a section called Check Constraints.…Right now it's saying there are no check constraints on this table.…I am going to add one.…It's typically called CK_ the name of the table.…What we need to type in is an expression.…
- Using T-SQL (Transact-SQL)
- Managing databases with SQL Server Management Studio
- Understanding database normalization
- Using SELECT statements
- Building indexes
- Monitoring database size and integrity
- Backing up and restoring databases
- Creating functions and stored procedures
- Managing database permissions
- Creating and formatting reports
- Adding charts to reports
- Creating and executing a simple SSIS package
Skill Level Beginner
Q: I'm having problems installing the free Express R2 version of SQL Server on Windows XP. I tried 64-bit and 32-bit versions. In the videos, the author installs from a DVD. Do I need to do the same?
Q: The link to the installer for the AdventureWorks sample database, as shown in the Chapter 2 movie "Installing sample databases," no longer works. Where can I find the installer?
A: Microsoft has reorganized its site. The sample files are still there, but they're a bit harder to find. To install them:
1) Visit http://msftdbprodsamples.codeplex.com/.
2) Click the link to "SQL Server 2008 R2 OLTP."
3) Click the AdventureWOkrs2008R2 Data File link and agree to the conditions to download the MDF file.
4) Move the MDF file to your SQL Server Directory, usually located at C:\Program Files\Microsfot SQL Server\MSSQL 10_50.MSSQLSERVER\MSSQL\DATA.
5) Open the SQL Sever Management Studio and connect to your instance using an account with administrative privileges.
6) Attach the sample database by right-clicking the Databases folder in the Object Explorer and choosing Attach from the pop-up menu.
7) Click the Add button in the next menu and navigate to the MDF file in the Locate Database Files window that appears. Select it and click OK.
8) Remove the reference to the log file in the "AdventureWorks2008R2" database details: pane by selecting the Log entry and clicking removing.*
9) Click OK to return to SQL Server Management Studio and complete the attachment process.
*MDF files are the "data" files for SQL Server databases. They often come along with LOG files (ldf files). This one didn't so we need to REMOVE the reference to the non-existent log file. Select the second row in the lower section (it should say File Type: Log and Message: Not Found) and click the REMOVE button.
For an illustrated version of these instructions (with screenshots), click here for a PDF version.
1. Getting Started
2. Installing SQL Server 2008 R2
3. Tools and System Databases
SQL Server system databases2m 22s
4. Creating Databases
5. Importing Existing Data
6. Retrieving Data with SQL
7. Inserting and Updating Data
8. SQL Functions
9. Stored Procedures and Transactions
10. Core Administration Tasks
11. Backing Up and Restoring
12. Security Features
13. Reporting Services
14. Integration Services
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