Setting SQL_MODE
In MySQL, the @@sql_mode parameter should generally use ONLY_FULL_GROUP_BY. If it doesn’t include it and you don’t have the ability to change the database parameters, you can use a MySQL PSM (Persistent Stored Module), like:
Create the set_full_group_by procedure:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | -- Drop procedure conditionally on whether it exists already. DROP PROCEDURE IF EXISTS set_full_group_by; -- Reset delimter to allow semicolons to terminate statements. DELIMITER $$ -- Create a procedure to verify and set connection parameter. CREATE PROCEDURE set_full_group_by() LANGUAGE SQL NOT DETERMINISTIC SQL SECURITY DEFINER COMMENT 'Set connection parameter when not set.' BEGIN /* Check whether full group by is set in the connection and if unset, set it in the scope of the connection. */ IF NOT EXISTS (SELECT NULL WHERE REGEXP_LIKE(@@SQL_MODE,'ONLY_FULL_GROUP_BY')) THEN SET SQL_MODE=(SELECT CONCAT(@@sql_mode,',ONLY_FULL_GROUP_BY')); END IF; END; $$ -- Reset the default delimiter. DELIMITER ; |
Run the following SQL command before you attempt the exercises in the same session scope:
CALL set_full_group_by(); |
As always, I hope this helps those looking for a solution. Naturally, you can simply use the SET command on line #21 above.
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