Problem solving: Error Code: 1093 when executing sql statement in MySQL

Problem scenario

mysql executes the followingSQL

update test set i_status=5 where s_id in (
	select max(s_id) as id from test where s_title is not null
	group by s_title,length(s_content) having count(*)>1
)

Execution error, suggesting Error Code: 1093. You can't specify target table 'car' for update in FROM clausethat: . This blog post mainly proposes solutions for this situation.

Problem environment

software	version
mysql	5.7.27

problem causes

This problem will occur if the table of the subquery operation and the update operation are the same table . However, if it is just a query operation, no error will be reported and it will be executed normally. If the following SQLis not an error, it can be executed normally.

select * from  test where s_id in (
	select max(s_id) as id from test where s_title is not null
	group by s_title,length(s_content) having count(*)>1
)

solution

This problem can be solved by treating the subquery as a subtable and isolating it. The updated version is SQLas follows:

update test  set i_status=5 where s_id in (
	select id from (
		select max(s_id) as id from test where s_title is not null
		group by s_title,length(s_content) having count(*)>1
	) as temp
)

to sum up

The problem was solved smoothly! ! !

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