3365
MySQLERRORNotableDDLHIGH confidence
Aggregate function not allowed in column default value
Production Risk
Low — DDL fails; table is not created or altered.
How to reproduce
trigger — this will error
trigger — this will error
CREATE TABLE t (total INT DEFAULT (COUNT(*)));
expected output
ERROR 3365 (HY000): Aggregate functions are not allowed in DEFAULT expressions.
Fix
Use a literal default
Use a literal default
CREATE TABLE t (total INT DEFAULT 0);
Why this works
Literal values are always valid in DEFAULT clauses.
What not to do
✕
Sources
Official documentation ↗
MySQL 8.0 — 3365 ER_AGGREGATE_FUNCTION_IN_DEFAULT_VALUE
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