SQL1816 error means?
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Failed to aggregate
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Failed to execute DISTINCT
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Failed to execute HAVING clause
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Failed to execute WHERE clause
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Correct answer
Explanation
SQL1816 indicates a failure during aggregation operations in SQL queries. This occurs when the database engine cannot successfully compute aggregate functions like SUM, COUNT, AVG, MAX, or MIN, often due to data type mismatches or grouping issues.
AI explanation
DB2's SQL1816N error is raised when an aggregate function cannot be evaluated as specified in the statement — for example, mixing aggregates with non-grouped columns incorrectly — so it specifically signals a failure to aggregate rather than a problem with DISTINCT, HAVING, or WHERE clause processing, which have their own distinct error codes.