System Functions
These scalar functions perform operations on and return information about values, objects, and settings in Microsoft® SQL Server™.
This table lists the system functions and their determinism property. For more information about function determinism, see Deterministic and Nondeterministic Functions.
| Function | Determinism |
|---|---|
| APP_NAME | Nondeterministic |
| CASE expression | Deterministic |
| CAST and CONVERT | Deterministic unless used with datetime, smalldatetime, or sql_variant. |
| COALESCE | Deterministic |
| COLLATIONPROPERTY | Nondeterministic |
| CURRENT_TIMESTAMP | Nondeterministic |
| CURRENT_USER | Nondeterministic |
| DATALENGTH | Deterministic |
| @@ERROR | Nondeterministic |
| fn_helpcollations | Deterministic |
| fn_servershareddrives | Nondeterministic |
| fn_virtualfilestats | Nondeterministic |
| FORMATMESSAGE | Nondeterministic |
| GETANSINULL | Nondeterministic |
| HOST_ID | Nondeterministic |
| HOST_NAME | Nondeterministic |
| IDENT_CURRENT | Nondeterministic |
| IDENT_INCR | Nondeterministic |
| IDENT_SEED | Nondeterministic |
| @@IDENTITY | Nondeterministic |
| IDENTITY (Function) | Nondeterministic |
| ISDATE | Deterministic only if used with the CONVERT function, the CONVERT style parameter is specified and the style parameter is not equal to 0, 100, 9, or 109. Styles 0 and 100 use the default format mon dd yyyy hh:miAM (or PM). Styles 9 and 109 use the default format plus milliseconds mon dd yyyy hh:mi:ss:mmmAM (or PM). |
| ISNULL | Deterministic |
| ISNUMERIC | Deterministic |
| NEWID | Nondeterministic |
| NULLIF | Deterministic |
| PARSENAME | Deterministic |
| PERMISSIONS | Nondeterministic |
| @@ROWCOUNT | Nondeterministic |
| ROWCOUNT_BIG | Nondeterministic |
| SCOPE_IDENTITY | Nondeterministic |
| SERVERPROPERTY | Nondeterministic |
| SESSIONPROPERTY | Nondeterministic |
| SESSION_USER | Nondeterministic |
| STATS_DATE | Nondeterministic |
| SYSTEM_USER | Nondeterministic |
| @@TRANCOUNT | Nondeterministic |
| USER_NAME | Nondeterministic |