mysql如何加快大表的ALTER TABLE操作速度 MYSQL的ALTER TABLE操作的性能对大表来说是个大问题。MYSQL执行大部分修改表结构操作的方法是用新的表结构创建一个空表，从旧表中查出所有数据插入新表，然后删除旧表。这样
$datos = mysql_query(\"SELECT * FROM usuarios LIMIT 0, 30 \"开发者_运维技巧); Who is a simple MySQL query in php, but i need the result organized by date and time. There is a field in my table who ha
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