MySQL: INSERT IF NOT EXISTS syntax

Bogdan — Tue, 09 Mar 2010 15:46:15 +0000

Thanks, that was an interesting comparison. I only had tens of thousands of rows, so didn’t pay attention to performance.

MySQL: INSERT IF NOT EXISTS syntax

Eddie — Tue, 09 Mar 2010 15:07:46 +0000

I did some speed benchmarking of these methods and found that ON DUPLICATE KEY is the faster that INSERT IGNORE. I also found that just letting the query fail because of a primary key constraint is faster than both. For my application, anyway. Your mileage may vary. More info in my “website” link.

MySQL: INSERT IF NOT EXISTS syntax

willieray — Tue, 01 Dec 2009 06:16:08 +0000

Fantastic!!! you saved my frazzled brain. if not exists was tormenting me.

MySQL: INSERT IF NOT EXISTS syntax

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MySQL: INSERT IF NOT EXISTS syntax

Phil — Sat, 07 Nov 2009 00:28:38 +0000

Thanks! Glad to know I’m not the only one thinking this way.

MySQL: INSERT IF NOT EXISTS syntax

Lyncis — Sun, 25 Oct 2009 23:31:56 +0000

Thanks for good explanation.

MySQL: INSERT IF NOT EXISTS syntax

IK — Wed, 23 Sep 2009 18:52:57 +0000

Great Post, thanks!
I am thinking that INSERT IGNORE would not overwrite like REPLACE would, should one want to insert the same text with different parameters. I will definitely try that now.

Regards

MySQL: INSERT IF NOT EXISTS syntax

Bogdan — Sat, 08 Aug 2009 14:28:26 +0000

Dollan, have you actually read the post text? Either I do not understand your problem, or it can indeed be solved using either INSERT IGNORE or REPLACE INTO.

MySQL: INSERT IF NOT EXISTS syntax

dollan — Wed, 05 Aug 2009 00:45:22 +0000

I have a table A (col1 INT, col2 VARCHAR(1), col3 VARCHAR(1)) where col1 is primary key
i’ve a record A(1, ‘A’,null)

I want to update/insert a records if exists/not-exists to get a result of A(1, ‘A’, ‘B’);

I can do this using update A set col2=’B’ where col1=1; But, I do not know whether col1=1 exists or not

what shuld i do?

MySQL: INSERT IF NOT EXISTS syntax

wladek — Wed, 24 Jun 2009 20:09:34 +0000

Thanks, this article is very helpful!

MySQL: INSERT IF NOT EXISTS syntax

Jacinto — Wed, 24 Jun 2009 17:33:28 +0000

thank you for your help, you are the best

MySQL: INSERT IF NOT EXISTS syntax

Todd — Thu, 29 Jan 2009 14:41:18 +0000

Thank you for the concise explanation.

MySQL: INSERT IF NOT EXISTS syntax

Bogdan — Wed, 29 Oct 2008 11:01:42 +0000

Cakirhal,

first of all, you will need to consult MySQL documentation for the exact queries you are using – the “returned rows”/”affected rows” count might be helpful.

Also, before executing the actual modification query, you can execute selection query (i.e. “SELECT … FROM”) in your program, to know for sure if the customer exists. After that, it is a trivial task to notify the user of any problems.

MySQL: INSERT IF NOT EXISTS syntax

cakirhal — Wed, 29 Oct 2008 09:24:35 +0000

thanks. it is very useful. Sometimes we want to send pop-up messagebox when we changed or ignord the same record. Your solutions are good but I want to know how to inform user that we changed or ignored the record. For example: “Customer couldn’t be added. Because the customer you entered is already exists.” So how can I determine whether users attempt is executed or ignored?

MySQL: INSERT IF NOT EXISTS syntax

Bogdan — Mon, 29 Sep 2008 19:55:56 +0000

Marius,

neither MySQL documentation, nor my (not so extensive) experience with MySQL raise any support for disabling described functionality for composite keys. As I understand, composite key is still a single key, and behaves as such. And MySQL documentation sometimes mentions that composite keys are just concatenated respective fields (columns).

Actually, it might be that I did apply the REPLACE or IGNORE approach to a composite-keyed table (and it was InnoDB at that time, now for that project I’m using MyISAM to save space). But I’m unsure – didn’t check the code since it was written (now almost a year ago).

MySQL: INSERT IF NOT EXISTS syntax

Marius — Mon, 29 Sep 2008 14:04:27 +0000

Would this work on InnoDB with composite keys as well? My task is to read only new entries from a log and insert them into a MySQL table. The table has a composite key.

(I could try this myself, but I have no MySQL box to test on for the next few weeks.)

MySQL: INSERT IF NOT EXISTS syntax

Bogdan — Sat, 30 Aug 2008 14:21:09 +0000

Geoffray,

if the MySQL optimization engine really does that, and if this is allowed (remember, we are triggering the ON DUPLICATE KEY event, and then trying to assign that key’s value to another value, even if it is the same), then this is a really good solution.

Based on your comment, I updated the post, as MySQL syntax in fact doesn’t allow the empty statement after ON (…) UPDATE.

MySQL: INSERT IF NOT EXISTS syntax

Geoffray — Thu, 28 Aug 2008 12:39:45 +0000

About your last option, I don’t think it’s possible to do nothing after the “ON DUPLICATE KEY UPDATE”. What you can do is updating the column (PRIMARY KEY or/and UNIQUE) which generate a duplicate entry error with it’s own value. I think MySQL will ignore the update because these values are similar, so it could also be a quite fast solution.

INSERT INTO `test`(id) VALUES (1) ON DUPLICATE KEY UPDATE id=id

MySQL: INSERT IF NOT EXISTS syntax

Bogdan — Mon, 04 Aug 2008 17:25:51 +0000

Teo,

As I didn’t do anything similar before, I can’t offer you a ready working solution.

But you should just try your query . The part before THEN should work (unless “insert ignore” is not compatible with “on duplicate key”). For THEN-part, I suspect different syntax might be needed – look for MySQL conditional statements IF-THEN-ELSE.

MySQL: INSERT IF NOT EXISTS syntax

Teo — Mon, 04 Aug 2008 11:41:58 +0000

Very useful, thank you! How about insert, update and delete in a single query, it’s possible? Something like:

insert ignore into table (field_one, field_two) values (values_one, values_two) on duplicate key update field_one = values(values_one), field_two = values(values_two) THEN QUERY FOR DELETE HERE?

Thanks

MySQL: INSERT IF NOT EXISTS syntax

Emir Bugra KOKSALAN — Tue, 22 Jul 2008 10:38:25 +0000

Thank you very much!!

MySQL: INSERT IF NOT EXISTS syntax

Tautvydas — Sun, 13 Jul 2008 10:53:34 +0000

Thanks!

MySQL: INSERT IF NOT EXISTS syntax

Bogdan — Tue, 24 Jun 2008 07:34:39 +0000

thanks

MySQL: INSERT IF NOT EXISTS syntax

ceteras — Mon, 23 Jun 2008 12:09:16 +0000

Very interesting, and helpful.

MySQL: INSERT IF NOT EXISTS syntax

MYSQL On Duplicate Key Do Nothing OR Insert If Not Exists — Sun, 20 Apr 2008 06:19:33 +0000

[...] may also find http://bogdan.org.ua/2007/10/18/mysql-insert-if-not-exists-syntax.html good reading on the [...]