By Julian Young


2010-11-11 13:10:22 8 Comments

I'm trying to delete records from one database based on a selection criteria of another. We have two tables, emailNotification which stores a list of jobs and emails. Then we have jobs. I want to clear out emailNotifications for jobs that have been closed. I found some earlier examples on Stackoverflow that lead me to this type of syntax (I was previously trying to do the join before the where).

DELETE FROM emailNotification
WHERE notificationId IN (
 SELECT notificationId FROM emailNotification e
 LEFT JOIN jobs j ON j.jobId = e.jobId
WHERE j.active = 1
)

I'm getting the error, you can't specify the target table 'emailNotication' for update in the FROM Clause.

4 comments

@Mahmut Gulerce 2018-10-21 10:14:55

If the aim is deleting matching rows, like deleting rows in 1st table which have relations in 2nd, to avoid deleting whole 1st table you should put additional "where" condition for 2nd table

DELETE f FROM firsttable f 
LEFT JOIN secondtable s ON f.related_id = .jobId 
WHERE s.related_id

@Aman Garg 2015-08-05 06:35:11

MySQL DELETE records with JOIN

Delete multiple records from multiple table using Single Query is As below:

You generally use INNER JOIN in the SELECT statement to select records from a table that have corresponding records in other tables. We can also use the INNER JOIN clause with the DELETE statement to delete records from a table and also the corresponding records in other tables e.g., to delete records from both T1 and T2 tables that meet a particular condition, you use the following statement:

DELETE T1, T2
FROM T1
INNER JOIN T2 ON T1.key = T2.key
WHERE condition

Notice that you put table names T1 and T2 between DELETE and FROM. If you omit the T1 table, the DELETE statement only deletes records in the T2 table, and if you omit the T2 table, only records in the T1 table are deleted.

The join condition T1.key = T2.key specifies the corresponding records in the T2 table that need be deleted.

The condition in the WHERE clause specifies which records in the T1 and T2 that need to be deleted.

@random 2015-08-13 20:22:12

@Umair 2019-05-08 10:04:55

From source code I see that was published on 2013-05-07 so definitely @Aman plagiarised :P

@Patrick McDonald 2010-11-11 13:31:28

You could try something like the following:

DELETE FROM emailNotification
WHERE jobId IN (
 SELECT jobId FROM jobs j
 WHERE j.active = 1
)

@Naved 2010-11-11 13:28:37

I am not sure about your requirement. What I understood from your question is you want to delete all the emails of jobs which are closed. try this one;

DELETE e FROM emailNotification e 
LEFT JOIN jobs j ON j.jobId = e.jobId 
WHERE j.active = 1 AND CURDATE() < j.closeDate

@Julian Young 2010-11-11 13:32:00

That's pretty much it yes, the emailnotification table stores a user and a job, it ensures users are not emailed more than once for a given job (think job alerts on a recruitment website). I'll give this a try now.

@Nate 2014-12-04 01:13:03

This is a great answer. What is subtle here is that you have to include the table alias after the DELETE keyword. I've never done that before, but I guess it is necessary when you have a JOIN in a delete statement.

@beipawel 2015-09-21 20:18:37

You can also delete the matching rows from the jobs table "j" when you write something like DELETE e, j FROM ... See here

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