Cardinality violations occur when a query that should return only a single row returns more than one row to an Embedded SQL™ application.
Message
Value
Description
Subquery returned more than 1 value. This is illegal when the subquery follows =, !=, <, <=, >, >=. or when the subquery is used as an expression.
21000
Occurs when:
A scalar subquery or a row subquery returns more than one row.
A select into parameter_list query in Embedded SQL returns more than one row.
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