SQL Dialects Reference/Functions and expressions/Misc expressions

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[edit] Misc functions

This page includes comparison tables which can be big and complex.

While it's perfectly all right to view them in their complete state, it is recommended to install a comparison tables extension that would allow to select particular columns of interest for comparison.

SQL version Feature Standard DB2 Firebird Ingres Linter MSSQL MySQL Oracle PostgreSQL SQLite Virtuoso
92 Convert value val to data type type CAST(val AS type)  ? CAST(val AS type)  ? CAST(val AS type)
CASTexpression as type
TO_CHAR
TO_NUMBER
TO_DATE
CAST(val AS type)
CONVERT(val, type)
CONVERT(val, type)
CAST(val AS type)
CAST(val AS type) CAST(val AS type)
val::type
 ?  ?
 ? Replace NULL within a val with a fallback value, return val intact, if it's non-NULL  ?  ?  ?  ? NVL(val, fallback) ISNULL(val, fallback) IFNULL(val, fallback) NVL(val, fallback) N/A N/A  ?
92 Return the first non-NULL value from a list of values (val1, val2, ...) COALESCE(val1, val2, ...) COALESCE(val1, val2) COALESCE(val1, val2)  ? COALESCE(val1, val2, ...) COALESCE(val1, val2, ...) COALESCE(val1, val2, ...) COALESCE(val1, val2, ...) COALESCE(val1, val2) coalesce(val1, val2, ...)  ?
92 Return NULL if two values a and b are equal NULLIF(a, b)  ? NULLIF(a, b)  ? NULLIF(a, b) NULLIF(a, b) NULLIF(a, b) NULLIF(a, b) NULLIF(a, b)  ?  ?
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