August 2012
Intermediate to advanced
1416 pages
33h 39m
English
book
Microsoft SQL Server 2012 Bible
by Adam Jorgensen, Jorge Segarra, Patrick LeBlanc, Jose Chinchilla, Aaron Nelson
Content preview from Microsoft SQL Server 2012 Bible
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Summary
User-defined functions expand the capabilities of SQL Server objects and open a world of flexibility within expressions and the SELECT statement.
The big ideas from this chapter follow:
- Scalar user-defined functions return a single value and must be deterministic.
- Inline table-valued user-defined functions are similar to views and return the results of a single SELECT statement.
- Multistatement, table-valued, user-defined functions use code to populate a table variable, which is then returned.
- The APPLY function can be used to pass data to an inline table-valued UDF or a multistatement, table-valued UDF from the outer query, similar to how a correlated subquery can receive data from the outer query.
T-SQL code can be packaged in stored procedures, user-defined functions, and triggers. The next chapter delves into stored procedures.
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