docs/sql-error-conditions-collation-mismatch-error-class.md

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title: COLLATION_MISMATCH error class
displayTitle: COLLATION_MISMATCH error class
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[SQLSTATE: 42P21](sql-error-conditions-sqlstates.html#class-42-syntax-error-or-access-rule-violation)

Could not determine which collation to use for string functions and operators.

This error class has the following derived error classes:

## EXPLICIT

Error occurred due to the mismatch between explicit collations: `<explicitTypes>`. Decide on a single explicit collation and remove others.

## IMPLICIT

Error occurred due to the mismatch between multiple implicit non-default collations. Use COLLATE function to set the collation explicitly.