Saturday, 16 September 2017

mysql multiple table DELETE rows syntax error

For multi-table deletes,



For the first multiple-table syntax, only matching rows from the tables listed before the FROM clause are deleted. the second multiple-table syntax, only matching rows from the tables listed in the FROM clause (before the USING clause) are deleted.



DELETE t1, t2 FROM t1 INNER JOIN t2 INNER JOIN t3
WHERE t1.id=t2.id AND t2.id=t3.id;


Or:



DELETE FROM t1, t2 USING t1 INNER JOIN t2 INNER JOIN t3
WHERE t1.id=t2.id AND t2.id=t3.id;

And for LEFT JOIN, you should use something like


DELETE t1 FROM t1 LEFT JOIN t2 ON t1.id=t2.id WHERE t2.id IS NULL;

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