<p>The query calls a stored procedure that expects GROUP BY, but the SELECT statement lacks a GROUP clause.</p>
<p>MySQL Error 1385: ER_NO_GROUP_FOR_PROC appears when a SELECT invokes a stored procedure that uses aggregation but forgets a GROUP BY clause. Add the correct GROUP BY or refactor the routine to remove the dependency on grouping to fix the issue.</p>
Select must have a group with this procedure
MySQL returns error 1385 when a stored function or procedure that relies on GROUP BY aggregation is invoked from a SELECT statement that lacks the required GROUP clause. The engine stops execution to avoid returning misleading aggregate results.
The error appears in MySQL 5.x and later whenever CALL or SELECT references a routine containing aggregate functions but the outer query omits GROUP BY or aggregate handling. Fixing the query or routine restores execution.
MySQL checks that a SELECT using stored procedures with aggregation also groups the result set. If the calling query does not include GROUP BY, the parser raises ER_NO_GROUP_FOR_PROC to enforce deterministic results.
The error can also surface when a view or trigger calls such a procedure, or when the routine was altered to add aggregates but dependent queries were not updated.
Add an explicit GROUP BY clause that matches the non aggregated columns, or refactor the procedure to remove its dependency on the caller's grouping. Confirm that every SELECT invoking the routine satisfies grouping rules.
If the procedure only returns scalar values, use SELECT ... FROM DUAL or set variables instead of relying on aggregation, eliminating the need for GROUP BY.
Reporting dashboards often wrap procedures that compute metrics. Ensure the dashboard query groups by the same dimensions used inside the procedure.
ETL scripts that call routines in INSERT INTO ... SELECT statements must include GROUP BY before loading aggregate data into fact tables.
Document the contract of each routine, noting whether the caller must supply GROUP BY. Embed ASSERT style checks at the start of procedures to validate input parameters instead of relying on the server error.
Use Galaxy's editor linting to highlight SELECT statements calling aggregation routines without grouping, preventing the problem before runtime.
ER_NON_GROUPING_FIELD_USED: raised when non aggregated column appears in SELECT without GROUP BY. Add grouping or aggregation.
ER_WRONG_GROUP_FIELD: occurs when GROUP BY references unfamiliar columns. Ensure listed columns exist in SELECT and tables.
The routine contains COUNT, SUM, AVG, etc., requiring grouping context from the caller.
The SELECT invoking the procedure fails to include a GROUP BY clause.
Underlying SELECT in a view or trigger lacks the needed GROUP BY.
A routine was modified to add aggregation, but dependent queries were not adjusted.
Non aggregated column in SELECT without GROUP BY.
GROUP BY contains unknown column or alias.
Aggregated and non aggregated columns mixed without GROUP BY.
Aggregate function used improperly in statement.
Yes, the grouping rule remains; procedures that need aggregation still trigger error 1385 when the caller lacks GROUP BY.
No server variable removes this validation. Rewrite the query or procedure instead.
MySQL cannot guarantee a single row unless grouping or aggregation rules are explicit. The error forces clarity.
Galaxy's linting flags calls to aggregation procedures without GROUP BY and its AI copilot suggests the corrected query instantly.
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