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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

The FOREIGN KEY Referential Integrity Constraint

The basic premise of a relational database is that tables are related. These relationships are maintained and enforced via referential integrity. FOREIGN KEY constraints are the declarative means for enforcing referential integrity in SQL Server. You implement FOREIGN KEY constraints by relating one or more columns in a table to the columns in a primary key or unique index. The columns in the referencing table can be referred to as foreign key columns. The table with the primary key or unique index can be referred to as the primary table. Figure 26.2 shows a relationship between the BusinessEntityAddress table and BusinessEntityAddress table. The foreign key in this example is AddressTypeID on ...

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Publisher Resources

ISBN: 9780768696585Purchase book