MySQL判断字符串是否是数字
SELECT * FROM **** WHERE trim(字段名) REGEXP '[^0-9]'=1
SELECT * FROM shop_count WHERE DATE(count_date)=current_date(); SELECT * FROM sho...
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...
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...
mysql> select CONCAT('My', 'S', 'QL');...