mysql的字符串连接符
mysql> select CONCAT('My', 'S', 'QL');
mysql -h ***.***.***.*** -P 3306 -u root -pmysqldump -h ***.***.***.*** -P 3...
SELECT CURDATE()当天日期...
DATE_ADD(now(),INTERVAL 1 DAY);...
SELECT product_brand FROM shop_product WHERE LENGTH(product_brand)>...
select count(id),字段from 表名 group by字段 having count(字段)>1;...
truncate table 表名...