Most mysql order by numeric related news are at:
More mysql order by numeric related news:
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...
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。
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...
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Write a simple query to get the second largest value of a table column? phpinterviewquestions.com 17 Mar 2012 | 04:54 pm
There are many ways that we can write this, But the simplest way in mysql is, SELECT * FROM country ORDER BY id DESC LIMIT 1, 1 plus there are some other methods as well, SELECT * FROM country ORD...
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