mysql的自动补齐
设置my.cnf : auto-rehash
mysql>use mysql; #这是关键
truncate table 表名...
SELECT product_brand FROM shop_product WHERE LENGTH(product_brand)>...
DELETE t1 FROM invest_year t1, invest_year t2 WHERE t1.pro_id = t2.pro_id AND t1.pro_year = t...
SELECT * FROM **** WHERE trim(字段名) REGEXP '[^0-9]'=1...
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...