mysql的字符串连接符
mysql> select CONCAT('My', 'S', 'QL');
SELECT product_brand FROM shop_product WHERE LENGTH(product_brand)>...
排名函数是SQL SERVER2005新增的函数。排名函数总共有四种,分别是:row_number、rank、 dense_rank 、ntile。row_number:顺序生成序号。rank:相同的...
DATE_ADD(now(),INTERVAL 1 DAY);...
truncate table 表名...
SELECT CURDATE()当天日期...
DELETE t1 FROM invest_year t1, invest_year t2 WHERE t1.pro_id = t2.pro_id AND t1.pro_year = t...