docs/sql-error-conditions-not-a-constant-string-error-class.md

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SQLSTATE: 42601

The expression <expr> used for the routine or clause <name> must be a constant STRING which is NOT NULL.

This error class has the following derived error classes:

NOT_CONSTANT

To be considered constant the expression must not depend on any columns, contain a subquery, or invoke a non deterministic function such as rand().

NULL

The expression evaluates to NULL.

WRONG_TYPE

The data type of the expression is <dataType>.