mysql的字符串连接符
mysql> select CONCAT('My', 'S', 'QL');
update 表名 SET log_Content = REPLACE(log_Content,'"upload','"/upload')...
1.date型转换成int型 UNIX_TIMESTAMP('2007-10-04 22:23:00') 2.int型转换成date型 FROM_UNIXTIME(97599...
设置my.cnf : auto-rehashmysql>use mysql; #这是关键...
select count(id),字段from 表名 group by字段 having count(字段)>1;...
减去一天SELECT DATE_SUB(CURDATE(), INTERVAL 1 DAY);减去一个小时hour(now())-1...
SELECT product_brand FROM shop_product WHERE LENGTH(product_brand)>...