统计mysql字段值的长度
SELECT product_brand FROM shop_product WHERE LENGTH(product_brand)>3;
SELECT product_brand FROM shop_product WHERE LENGTH(product_brand)>3;
判断字符串(string)中是否包含另一个字符串(subStr)locate(subStr,string) :函数返回subStr在string中出现的位置实际运用SELECT LOCAT...
mysql> select CONCAT('My', 'S', 'QL');...
设置my.cnf : auto-rehashmysql>use mysql; #这是关键...
SELECT * FROM shop_count WHERE DATE(count_date)=current_date(); SELECT * FROM sho...
truncate table 表名...
select count(id),字段from 表名 group by字段 having count(字段)>1;...