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Builtin functions

Reports truncations of string arguments in ISNULL functions.

The ISNULL syntax is ISNULL(check_expression, replacement_value).

According to ISNULL at, replacement_value will be truncated if replacement_value is longer than check_expression.

Example (Microsoft SQL Server):

DECLARE @name1 VARCHAR(2) = NULL; DECLARE @name2 VARCHAR(10) = 'Example'; DECLARE @name3 VARCHAR(2) = 'Hi'; -- `@name2` is VARCHAR(10) and will be truncated SELECT ISNULL(@name1, @name2); -- `@name3` is VARCHAR(2) as `@name1` and will not be truncated SELECT ISNULL(@name1, @name3);

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Database Tools and SQL, 233.SNAPSHOT

Last modified: 13 July 2023