mysql的字符串连接符
mysql> select CONCAT('My', 'S', 'QL');
减去一天SELECT DATE_SUB(CURDATE(), INTERVAL 1 DAY);减去一个小时hour(now())-1...
SELECT CURDATE()当天日期...
update 表名 SET log_Content = REPLACE(log_Content,'"upload','"/upload')...
SELECT * FROM **** WHERE trim(字段名) REGEXP '[^0-9]'=1...
DATE_ADD(now(),INTERVAL 1 DAY);...
truncate table 表名...