mysql 常用技巧

1.正则使用 比 LIKE 会牺牲很多的系统资源 尽量不要用

　　正则的语法和JS PHP 差不多

　　select * from t1 where email REGEXP "@163[,.]com$";

　　select * from t1 where email like "%@163.com" or email like "%@163,com"

2.REPLACE 函数的使用

　　UPDATE `v9_zhushou` SET `thumb` = REPLACE(`thumb`,
‘http://localhost/ciwei/‘, ‘http://www.qciwei.com/ciwei/‘) WHERE `id` > 0

　　UPDATE `v9_zhushou_data` SET `iphone` = REPLACE(`iphone`,
‘http://localhost/ciwei/‘, ‘http://www.qciwei.com/ciwei/‘) WHERE `id` = 300

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