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Convert all your MySQL database text fields to unicode (or any other encoding) tiplite.com 11 May 2011 | 07:49 am
Have you ever faced a problem when the text fields in your database have different encoding? This usually happens when you import table structure from another database with a different encoding, or wh...
MySQL Tips & Tricks: Using ORDER BY FIELD and GROUP_CONCAT() httpremix.com 12 Jun 2008 | 07:00 pm
I love databases because I always feel there is a way for retrieving my data in any shape or form I desire. Trying to find the correct syntax can sometimes be frustrating, however. Here are two tricks...
mysql order by asc desc 优化 mysqlinfo.com 14 Jun 2012 | 10:22 am
今天遇到个问题 mysql 有种sql语句查询效率不高,用完索引后仍然有filesort排序 select * from table_name where a=xx order by b asc,c desc; 开始觉得可能用索引就可以解决比如 建立 create index idx_x on table_name(a,b asc,c desc); 后来发现仍然不走索引，是mysql的一个b...
Stored Procedure MySQL Example 2k8618.blogspot.com 19 May 2013 | 01:57 am
MySQl Stored Procedure Example Table: mysql> desc employees; +--------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra... Read more......
Stored Procedure MySQL Example 2k8618.blogspot.com 19 May 2013 | 01:57 am
MySQl Stored Procedure Example Table: mysql> desc employees; +--------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra... Read more......
回复于: mysql order by 和limit索引的问题 askhellodba.com 19 Feb 2013 | 08:15 am
你的表有多少条记录？第三个肯定是不走索引的。当查询的记录超过表总量的一定比例就会直接全表扫描。比例是多少来着我忘记了。。 其他几种情况就不知道了。
Convert all MySQL tables and fields to UTF8 charset & collation mandagreen.com 22 Oct 2012 | 05:54 pm
At some point in your web dev life you might face the “Illegal mix of collations” mysql error. Nothing complicated, you just need all your tables to use the same charset and collation and this can be ...
MySQL ORDER BY RAND() – Qual a melhor forma de fazer? jf.eti.br 23 Aug 2013 | 09:45 am
Essa é uma dúvida que volta e meia aparece nos fóruns, como obter linhas aleatórias em uma query. Normalmente o que vemos é algo assim: SELECT * FROM tabela ORDER BY rand(); Contudo, o que muitos nã...
mysql order by null netingcn.com 11 Aug 2013 | 08:28 pm
order by null用途是强制对查询结果禁用排序。通过explain检查查询语句时候，如果看到Extra列中有Using filesort，这是对性能有一定影响的，特别是使用了group by时，就算你没有显示的指定order by，mysql会默认按照分组字段进行排序。某些情况下是没有必要使用排序的，例如在处理表报数据的时候（把原始表数据统计后插入到一个用于报表查询的表），则完全可以可以使...
Secure PHP Form Mailer Script dagondesign.com 6 Jul 2009 | 01:55 pm
This is the PHP version of my secure form mailer script. This script has a wide range of features including: an easy to use dynamic form generation system (any number of fields, in any order), multipl...
