Comments on: Update Multiple Rows With Different Values and a Single SQL Query

By: Mike

Mike — Thu, 26 Apr 2012 07:13:14 +0000

I just bundle all the update queries into a transaction and run that. That only sends one request to the datatabase. That way I can update multiple values in the same SQL query. Can your method only update one parameter in the query at a time?

By: putude

putude — Wed, 18 Apr 2012 07:40:59 +0000

This trick is very helpful. Save time and resource. Thank you for sharing.

By: Vyshak

Vyshak — Sat, 14 Apr 2012 06:52:53 +0000

How can i use this statements to update a emp_Salary with three conditions as follows
1.sal >=2000 and =6000 with 2%
3.sal<2000 with 20%

By: 10 sql tips to speed up your database » MyWeblog

10 sql tips to speed up your database » MyWeblog — Tue, 10 Apr 2012 02:40:58 +0000

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By: Guilherme

Guilherme — Sun, 19 Feb 2012 01:39:41 +0000

Thanks very much. This helped me alot.

By: Simon

Simon — Wed, 01 Feb 2012 14:54:56 +0000

Hi,
Thanks for this, it helped a lot.

I would have one remark/question though. I tested it with and without the WHERE clause. And when tested without the clause, all entries not concerned by the WHEN clause were set to null.
To fix this, I had to add a “else display_order” to the query.
Didn’t you come accross this?
Thanks again!

By: Jocsism

Jocsism — Mon, 16 Jan 2012 20:43:48 +0000

Good one sir this is what i’m looking for thanks! sir is it possible to use column increments like display_order=display_order+1 based on your example, because in my case im trying to update the quantity of the inventory based on their status. like for example i updated a certain item to status ‘InStock’ i would also like my table inventory column ‘InStock’ value to increment . i would appreciate it very much if you email me regarding this question. thank you.

By: Efficient Update SQL, updating multiple rows with one SQL statement, Avoiding Loops | DIGG LINK

Mon, 09 Jan 2012 11:18:16 +0000

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By: Pradeep Kumar Sharma (http://www.techtt.org)

Pradeep Kumar Sharma (http://www.techtt.org) — Fri, 23 Dec 2011 07:26:47 +0000

it should be like

UPDATE empsal SET sal =
CASE WHEN sal BETWEEN 100 AND 500 THEN sal + 5000
WHEN sal BETWEEN 40000 AND 55000 THEN sal + 7000
else sal

END

By: Eilo

Eilo — Wed, 21 Dec 2011 04:05:22 +0000

This was the most amazing tip on sql ever!!

I was able to solve a 2963 + 1520 duplicated rows (from 2 different dbs) with a single query….. obviously i made a table_copy and use the same method to achieve the goal.

UPDATE characters AS t, (SELECT `guid`,`name` FROM `characters_copy` GROUP BY `name` HAVING COUNT(`name`)=2) AS n SET t.`name`=CONCAT(t.`name`,’aaa’) WHERE t.guid=n.guid;

Thank you so much!