You can't specify target table for update in FROM clause
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I have a simple mysql table:
CREATE TABLE IF NOT EXISTS `pers` ( `persID` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(35) NOT NULL, `gehalt` int(11) NOT NULL, `chefID` int(11) DEFAULT NULL, PRIMARY KEY (`persID`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=4 ; INSERT INTO `pers` (`persID`, `name`, `gehalt`, `chefID`) VALUES (1, 'blb', 1000, 3), (2, 'as', 1000, 3), (3, 'chef', 1040, NULL);
I tried to run following update, but I get only the error 1093:
UPDATE pers P SET P.gehalt = P.gehalt * 1.05 WHERE (P.chefID IS NOT NULL OR gehalt < (SELECT ( SELECT MAX(gehalt * 1.05) FROM pers MA WHERE MA.chefID = MA.chefID) AS _pers ))
I searched for the error and found from mysql following page http://dev.mysql.com/doc/refman/5.1/en/subquery-restrictions.html, but it doesn't help me.
What shall I do to correct the sql query?
The problem is that MySQL, for whatever inane reason, doesn't allow you to write queries like this:
UPDATE myTable SET myTable.A = ( SELECT B FROM myTable INNER JOIN ... )
That is, if you're doing an
DELETE on a table, you can't reference that table in an inner query (you can however reference a field from that outer table...)
The solution is to replace the instance of
myTable in the sub-query with
(SELECT * FROM myTable), like this
UPDATE myTable SET myTable.A = ( SELECT B FROM (SELECT * FROM myTable) AS something INNER JOIN ... )
This apparently causes the necessary fields to be implicitly copied into a temporary table, so it's allowed.
I found this solution here. A note from that article:
You don’t want to just
SELECT * FROM tablein the subquery in real life; I just wanted to keep the examples simple. In reality, you should only be selecting the columns you need in that innermost query, and adding a good
WHEREclause to limit the results, too.
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You can make this in three steps:
CREATE TABLE test2 AS SELECT PersId FROM pers p WHERE ( chefID IS NOT NULL OR gehalt < ( SELECT MAX ( gehalt * 1.05 ) FROM pers MA WHERE MA.chefID = p.chefID ) )
UPDATE pers P SET P.gehalt = P.gehalt * 1.05 WHERE PersId IN ( SELECT PersId FROM test2 ) DROP TABLE test2;
UPDATE Pers P, ( SELECT PersId FROM pers p WHERE ( chefID IS NOT NULL OR gehalt < ( SELECT MAX ( gehalt * 1.05 ) FROM pers MA WHERE MA.chefID = p.chefID ) ) ) t SET P.gehalt = P.gehalt * 1.05 WHERE p.PersId = t.PersId
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In Mysql, you can not update one table by subquery the same table.
You can separate the query in two parts, or do
UPDATE TABLE_A AS A INNER JOIN TABLE_A AS B ON A.field1 = B.field1 SET field2 = ?
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Make a temporary table (tempP) from a subquery
UPDATE pers P SET P.gehalt = P.gehalt * 1.05 WHERE P.persID IN ( SELECT tempP.tempId FROM ( SELECT persID as tempId FROM pers P WHERE P.chefID IS NOT NULL OR gehalt < (SELECT ( SELECT MAX(gehalt * 1.05) FROM pers MA WHERE MA.chefID = MA.chefID) AS _pers ) ) AS tempP )
I've introduced a separate name (alias) and give a new name to 'persID' column for temporary table
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It's quite simple. For example, instead of writing:
INSERT INTO x (id, parent_id, code) VALUES ( NULL, (SELECT id FROM x WHERE code='AAA'), 'BBB' );
you should write
INSERT INTO x (id, parent_id, code) VALUES ( NULL, (SELECT t.id FROM (SELECT id, code FROM x) t WHERE t.code='AAA'), 'BBB' );
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- Possible duplicate of MySQL Error 1093 - Can't specify target table for update in FROM clause
- I don't think the reason is inane. Think about the semantics. Either MySQL has to keep a copy of the table before the update started, or the inner query might use data that has already been updated by the query as it's in progress. Neither of these side-effects is necessarily desirable, so the safest bet is to force you to specify what will happen using an extra table.
- @siride: Other databases, such as MSSQL or Oracle, don't have this arbitrary restriction
- @BlueRaja-DannyPflughoeft: it's not arbitrary. It's reasonable design decision based on the costs of the alternatives. The other DB systems chose to deal with those costs anyway. But those systems don't, e.g., let you include non-aggregated columns in SELECT lists when you use GROUP BY, and MySQL does. I'd argue that MySQL is in the wrong here, and I might say the same of the other DBMSs for UPDATE statements.
- @siride From a relational algebra point of view,
(SELECT * FROM T)are completely equivalent. They are the same relation. Therefore this is an arbitrary, inane restriction. More specifically, it's a workaround to coerce MySQL into doing something that it clearly can do, but for some reason it cannot parse in its simpler form.
- In my case the accepted solution didn't work because my table was simply too large. The query never completed. Apparently this is taking too many internal resources. Instead I created a View with the inner query and used it for the data selection, which worked absolutely fine.
DELETE FROM t WHERE tableID NOT IN (SELECT viewID FROM t_view);Also I recommend running
OPTIMIZE TABLE t;afterwards to reduce the size of the table.
- Well yeah, most subqueries can be rewritten as multiple steps with
CREATE TABLEstatements - I hope the author was aware of this. However, is this the only solution? Or can the query be rewritten with subqueries or joins? And why (not) do that?
- I think you have a capitalization error in your second solution. Shouldn't
UPDATE Pers Pread
UPDATE pers P?
- Tried this solution and for a large number of entries in temporary/second table the query can be very slow; try to create temporary/second table with an index/primary key [see dev.mysql.com/doc/refman/5.1/en/create-table-select.html ]
- As @Konerak states, this isn't really the best answer. The answer from BlueRaja below seems best to me. Upvotes seem to agree.
- @Konerak, Doesn't
CREATE TABLE AS SELECTgive horrible performance?
SELECT ... SET? I've never heard about this.
- @grisson Thanks for the clarification. Now I get why my IN clause doesn't work - I was targeting the same table.