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Re: MySQL 5.5.8 - Configuration Settings Suggestions
Posted by: Aftab Khan ()
Date: July 05, 2012 02:18AM

>This construct scares me:
>IN (1, NULL)
>NULL is generally not treated as a "value" that can be compared.

This construct looks ok to me. In MySQL, 0 or NULL means false and anything else means true, here is the test case:

mysql> select 1 IN (1,NULL), 1 IN (2,NULL),  1 IN(2,3), NULL IN(2,3);
+---------------+---------------+-----------+--------------+
| 1 IN (1,NULL) | 1 IN (2,NULL) | 1 IN(2,3) | NULL IN(2,3) |
+---------------+---------------+-----------+--------------+
|             1 |          NULL |         0 |         NULL |
+---------------+---------------+-----------+--------------+
1 row in set (0.00 sec)

can you please explain what's your concern?



Edited 2 time(s). Last edit at 07/05/2012 03:37AM by Aftab Khan.

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Subject Views Written By Posted
MySQL 5.5.8 - Configuration Settings Suggestions 1259 Samir Dash 06/19/2012 03:53AM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 676 Aftab Khan 06/25/2012 05:44AM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 985 Samir Dash 06/25/2012 11:00AM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 719 Samir Dash 06/25/2012 11:01AM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 566 Samir Dash 06/25/2012 11:03AM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 736 Aftab Khan 06/25/2012 12:23PM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 638 Samir Dash 06/26/2012 02:20AM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 675 Aftab Khan 06/26/2012 03:18AM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 957 Samir Dash 06/26/2012 03:36AM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 661 Aftab Khan 06/26/2012 05:01AM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 629 Samir Dash 06/28/2012 02:01AM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 858 Aftab Khan 06/29/2012 12:59AM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 624 Samir Dash 06/29/2012 01:12AM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 622 Samir Dash 06/29/2012 02:14AM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 746 Aftab Khan 06/29/2012 02:46AM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 627 Samir Dash 06/29/2012 03:27AM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 648 Aftab Khan 06/29/2012 07:43AM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 657 Samir Dash 06/29/2012 07:22PM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 691 Rick James 06/29/2012 06:14PM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 650 Samir Dash 06/29/2012 07:39PM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 682 Aftab Khan 06/30/2012 01:27AM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 595 Samir Dash 06/30/2012 01:48AM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 588 Aftab Khan 06/30/2012 01:53AM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 571 Samir Dash 06/30/2012 02:20AM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 568 Aftab Khan 06/30/2012 02:39AM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 642 Samir Dash 06/30/2012 04:35AM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 626 Aftab Khan 06/30/2012 06:02AM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 679 Samir Dash 07/03/2012 09:57AM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 621 Rick James 07/04/2012 06:39AM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 615 Aftab Khan 07/05/2012 02:18AM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 593 Peter Brawley 07/05/2012 11:01AM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 608 Aftab Khan 07/05/2012 12:53PM
Re: MySQL 5.5.8 - Configuration Settings Suggestions 595 Rick James 07/06/2012 03:41PM


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