How to delete rows from two tables using INNER JOIN in mysql?

Question

I want to delete all rows in both tables where the chart_id is 1, but it wont work and I dont have any clue why.

DELETE `cms_module_charts` 
FROM `cms_module_charts` 
INNER JOIN `cms_module_charts_kategorie` 
ON `cms_module_charts_kategorie`.`chart_id`=`cms_module_charts`.`chart_id`
WHERE `chart_id`= 1

This is the error: Unexpected character. (near " cms_module_charts " at position 7)

Answer 1

From the MySQL Docs it looks like you can do this easily:

 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;

It also looks like the newer, preferable, JOIN standard is acceptable and I have no idea why your query is complaining. Are you sure you haven't got any strange characters in your query?

Answer 2

The standard SQL syntax is DELETE FROM , without nothing butspace between DELETE and FROM

Try this:

DELETE FROM (`cms_module_charts` INNER JOIN `cms_module_charts_kategorie` 
ON `cms_module_charts_kategorie`.`chart_id`=`cms_module_charts`.`chart_id`)
WHERE `chart_id`= 1

Answer 3

我认为在您的数据库方案中，您应该使用ON DELETE CASCADE ，然后在删除行时，它会删除其引用，但是当您使用联接删除时，这没有任何意义。