mysql like语句

数据库模糊查询like语句：
$sql = "select * from table where title like '%中国%'";
//包含“中国”两个字
$sql = "select * from table where title like '中国%'";
//以“中国”开头
$sql = "select * from table where title like '%中国'";
//以“中国”结尾
$sql = "select * from table where title like '[ALN]%'";
//以A、L、N开头
$sql = "select * from table where title like '%[ALN]'";
//以A、L、N结尾
$sql = "select * from table where title like '[!ALN]%'";
//不以A、L、N开头

in语句：
$sql = "select * from table where name in ('张','梁');
//获取name等于“张”或者“梁”的信息

mysql_num_rows()
//获取结果集中行的数

ceil() //向上取整数
floor()
//向下取整数

mysql教程：http://www.w3school.com.cn/sql/index.asp