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Microsoft® SQL Server 2008 R2 Unleashed
book

Microsoft® SQL Server 2008 R2 Unleashed

by Ray Rankins, Paul Bertucci, Chris Gallelli, Alex T. Silverstein
September 2010
Intermediate to advanced content levelIntermediate to advanced
1704 pages
111h 8m
English
Sams
Content preview from Microsoft® SQL Server 2008 R2 Unleashed

Creating Constraints

You can define constraints on a single column or on multiple columns. Single-column constraints are referred to as column-level constraints. You can define this type of constraint when you create the column on the table. Constraints that reference multiple columns must be defined on the table and are considered table-level constraints. Table-level constraints must be defined after all the referenced columns in the table are created.

Using T-SQL to Create Constraints

You can create constraints with T-SQL by using the CREATE TABLE or ALTER TABLE statement. When you create a column-level constraint by using the CREATE TABLE statement, the CONSTRAINT keyword and constraint definition are included immediately after the column ...

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Publisher Resources

ISBN: 9780768696585Purchase book