docs/sql-error-conditions-complex-expression-unsupported-input-error-class.md

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title: COMPLEX_EXPRESSION_UNSUPPORTED_INPUT error class
displayTitle: COMPLEX_EXPRESSION_UNSUPPORTED_INPUT error class
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[SQLSTATE: 42K09](sql-error-conditions-sqlstates.html#class-42-syntax-error-or-access-rule-violation)

Cannot process input data types for the expression: `<expression>`.

This error class has the following derived error classes:

## MISMATCHED_TYPES

All input types must be the same except nullable, containsNull, valueContainsNull flags, but found the input types `<inputTypes>`.

## NO_INPUTS

The collection of input data types must not be empty.