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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

Scalar Functions

A scalar function is like the standard built-in functions provided with SQL Server. It returns a single scalar value that can be used anywhere a constant expression can be used in a query. (You saw an example of this in the earlier description of the getonlydate() function.)

A scalar function typically takes one or more arguments and returns a value of a specified data type. Every T-SQL function must return a result using the RETURN statement. The value to be returned can be contained in a local variable defined within the function, or the value can be computed in the RETURN statement. The following two functions are variations of a function that returns the average price for a specified type of book from the titles table:

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Publisher Resources

ISBN: 9780768696585Purchase book