The following reasons are possible:
- In a <CREATE VIEW statement>, the number of view table columns to be defined must be equal to the number of columns issued as the <QUERY EXPRESSION> result. In the present case, there are more columns in the <QUERY request> result than view table columns defined.
- The number of <SUBQUERY> output columns specified in a <SET UPDATE clause> must be precisely one. In some SQLMODEs, this restriction also applies to <COMPARISON PREDICATE>, <QUANTIFIED PREDICATE> and <IN PREDICATE>. In the present case, the <SUBQUERY> produced more than one output column.
- An SQL statement for data retrieval was issued. The number of output columns must be less than or equal to 254. This number was exceeded.