Comments on: MySQL Data Type Optimization Tips http://verysimple.com/2006/10/22/mysql-data-type-optimization-tips/ Custom Software Tue, 15 May 2012 07:26:47 +0000 hourly 1 http://wordpress.org/?v=3.3.2 By: mysql InnoDB CONSTRAINT | Mr.Meng的日志空间 http://verysimple.com/2006/10/22/mysql-data-type-optimization-tips/#comment-5366 mysql InnoDB CONSTRAINT | Mr.Meng的日志空间 Tue, 28 Feb 2012 06:15:23 +0000 http://www.verysimple.com/blog/?p=57#comment-5366 [...] 这两字段必须严格地一致匹配，更多关于signed 和 unsigned 的信息，请参阅：http://www.verysimple.com/blog/?p=57 2， 你试图引用的其中一个外键没有建立起索引，或者不是一个primary key , [...] [...] 这两字段必须严格地一致匹配，更多关于signed 和 unsigned 的信息，请参阅：http://www.verysimple.com/blog/?p=57 2， 你试图引用的其中一个外键没有建立起索引，或者不是一个primary key , [...]

]]> By: Mike http://verysimple.com/2006/10/22/mysql-data-type-optimization-tips/#comment-5215 Mike Fri, 13 Jan 2012 07:48:41 +0000 http://www.verysimple.com/blog/?p=57#comment-5215 Thanks for the very informative article. Can I suggest though that you change either the background or the font color. Gray over gray seems hard on the eyes. Thanks for the very informative article. Can I suggest though that you change either the background or the font color. Gray over gray seems hard on the eyes.

]]> By: MySQL Error Number 1005 Can’t create table ‘.mydb#sql-328_45.frm’ (errno: 150) | VerySimple http://verysimple.com/2006/10/22/mysql-data-type-optimization-tips/#comment-3397 MySQL Error Number 1005 Can’t create table ‘.mydb#sql-328_45.frm’ (errno: 150) | VerySimple Sun, 03 Jul 2011 20:18:59 +0000 http://www.verysimple.com/blog/?p=57#comment-3397 [...] The two key fields type and/or size is not an exact match. For example, if one is INT(10) the key field needs to be INT(10) as well and not INT(11) or TINYINT. You may want to confirm the field size using SHOW CREATE TABLE because Query Browser will sometimes visually show just INTEGER for both INT(10) and INT(11). You should also check that one is not SIGNED and the other is UNSIGNED. They both need to be exactly the same. (More about signed vs unsigned here). [...] [...] The two key fields type and/or size is not an exact match. For example, if one is INT(10) the key field needs to be INT(10) as well and not INT(11) or TINYINT. You may want to confirm the field size using SHOW CREATE TABLE because Query Browser will sometimes visually show just INTEGER for both INT(10) and INT(11). You should also check that one is not SIGNED and the other is UNSIGNED. They both need to be exactly the same. (More about signed vs unsigned here). [...]

]]> By: Webvigator！ » MySQL 创建外键关联一定要注意的地方 http://verysimple.com/2006/10/22/mysql-data-type-optimization-tips/#comment-2802 Webvigator！ » MySQL 创建外键关联一定要注意的地方 Wed, 11 May 2011 09:33:36 +0000 http://www.verysimple.com/blog/?p=57#comment-2802 [Chinese translation of this page] [...] 1， 两个字段的类型或者大小不严格匹配，例如，如果一个是INT(10), 那么外键也必须设置成INT(10), 而不是 INT(11) 也不能是 TINYINT. 你得使用 SHOW 命令来查看字段的大小，因为一些查询浏览器有时候把 int(10) 和int(11) 都显示为integer。另外，你还必须确定两个字段是否一个为 SIGNED,而另一个又是UNSIGNED, 这两字段必须严格地一致匹配，更多关于signed 和 unsigned 的信息，请参阅：http://www.verysimple.com/blog/?p=57 [...] [Chinese translation of this page]

[...] 1， 两个字段的类型或者大小不严格匹配，例如，如果一个是INT(10), 那么外键也必须设置成INT(10), 而不是 INT(11) 也不能是 TINYINT. 你得使用 SHOW 命令来查看字段的大小，因为一些查询浏览器有时候把 int(10) 和int(11) 都显示为integer。另外，你还必须确定两个字段是否一个为 SIGNED,而另一个又是UNSIGNED, 这两字段必须严格地一致匹配，更多关于signed 和 unsigned 的信息，请参阅：http://www.verysimple.com/blog/?p=57 [...]

]]> By: Staš http://verysimple.com/2006/10/22/mysql-data-type-optimization-tips/#comment-1861 Staš Mon, 17 Jan 2011 10:48:35 +0000 http://www.verysimple.com/blog/?p=57#comment-1861 Good tips! Good tips!

]]> By: Cullun http://verysimple.com/2006/10/22/mysql-data-type-optimization-tips/#comment-113 Cullun Fri, 02 Apr 2010 14:10:10 +0000 http://www.verysimple.com/blog/?p=57#comment-113 Great read, thanks for the information. Great read, thanks for the information.

]]> By: House Numbers http://verysimple.com/2006/10/22/mysql-data-type-optimization-tips/#comment-112 House Numbers Wed, 11 Nov 2009 05:20:54 +0000 http://www.verysimple.com/blog/?p=57#comment-112 Great post! I was able to noticeable reduce the size of my db by changing some of my primary key fields that were INT into something more appropriate like UNSIGNED SMALLINT, UNSIGNED TINYINT, etc where it was appropriate. thanks for the tips! Great post! I was able to noticeable reduce the size of my db by changing some of my primary key fields that were INT into something more appropriate like UNSIGNED SMALLINT, UNSIGNED TINYINT, etc where it was appropriate.
thanks for the tips!

]]> By: nickmallare.com » Blog Archive » MySQL Datatype INT: Signed vs. Unsigned http://verysimple.com/2006/10/22/mysql-data-type-optimization-tips/#comment-111 nickmallare.com » Blog Archive » MySQL Datatype INT: Signed vs. Unsigned Mon, 31 Aug 2009 14:30:36 +0000 http://www.verysimple.com/blog/?p=57#comment-111 [...] source: http://www.verysimple.com/blog/2006/10/22/mysql-data-type-optimization-tips/ [...] [...] source: http://www.verysimple.com/blog/2006/10/22/mysql-data-type-optimization-tips/ [...]

]]> By: Jim http://verysimple.com/2006/10/22/mysql-data-type-optimization-tips/#comment-110 Jim Wed, 25 Mar 2009 00:04:42 +0000 http://www.verysimple.com/blog/?p=57#comment-110 Thanks for the useful tips! Great read for a newstart @ mysql. Thanks for the useful tips! Great read for a newstart @ mysql.

]]> By: Ramon Bispo http://verysimple.com/2006/10/22/mysql-data-type-optimization-tips/#comment-109 Ramon Bispo Mon, 16 Jul 2007 01:57:27 +0000 http://www.verysimple.com/blog/?p=57#comment-109 This is very useful! Thanks! This is very useful!

Thanks!

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