MySQL delete with nested select query

问题

I have the following MySQL query:

DELETE FROM catalogue 
WHERE catalogue_id IN (
  SELECT catalogue_id 
  FROM catalogue 
  WHERE (
    product_id = (SELECT product_id FROM catalogue WHERE catalogue_id = '2290') 
    AND length_id = (SELECT length_id FROM catalogue WHERE catalogue_id = '2290') 
    AND gauge_id = (SELECT gauge_id FROM catalogue WHERE catalogue_id = '2290')
  )
)

But when I attempt to execute I get the following error message:

You can't specify target table 'catalogue' for update in FROM clause

Could someone advise on where I'm going wrong?

回答1:

Perform double nesting

DELETE FROM catalogue 
WHERE catalogue_id IN (SELECT catalogue_id FROM (
  SELECT catalogue_id 
  FROM catalogue 
  WHERE (
    product_id = (SELECT product_id FROM catalogue WHERE catalogue_id = '2290') 
    AND length_id = (SELECT length_id FROM catalogue WHERE catalogue_id = '2290') 
    AND gauge_id = (SELECT gauge_id FROM catalogue WHERE catalogue_id = '2290')
  )) x
)

It fools mysql

回答2:

Or you can use temporary table:

  CREATE TEMPORARY TABLE t AS
  SELECT catalogue_id 
  FROM catalogue 
  WHERE (
    product_id = (SELECT product_id FROM catalogue WHERE catalogue_id = '2290') 
    AND length_id = (SELECT length_id FROM catalogue WHERE catalogue_id = '2290') 
    AND gauge_id = (SELECT gauge_id FROM catalogue WHERE catalogue_id = '2290')
  );

  DELETE FROM catalogue WHERE catalogue_id IN (SELECT catalogue_id FROM t);

With your query you got You can't specify target table 'catalogue' for update in FROM clause because you can't make select and update on the same table in one query.

来源：https://stackoverflow.com/questions/7298504/mysql-delete-with-nested-select-query

标签

mysql

sql-delete