April 2001
Beginner
792 pages
17h 51m
English
Content preview from Microsoft® SQL Server™ 2000 Programming by Example
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Deterministic and Nondeterministic Functions
Some functions always return the same value when called with the same set of arguments. These functions are called deterministic. This is important if you want to create a clustered index on a view or any index on a computed column, because you can create these indexes only if they use deterministic functions.
Most of the built-in functions are deterministic, such as
| ABS | DATEDIFF | PARSENAME |
| ACOS | DAY | POWER |
| ASIN | DEGREES | RADIANS |
| ATAN | EXP | ROUND |
| ATN2 | FLOOR | SIGN |
| CEILING | ISNULL | SIN |
| COALESCE | ISNUMERIC | SQUARE |
| COS | LOG | SQRT |
| COT | LOG10 | TAN |
| DATALENGTH | MONTH | YEAR |
| DATEADD | NULLIF |
Some built-in functions are deterministic or nondeterministic, depending on the way you use them:
CAST is deterministic for every type ...
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