MySQL判断字符串是否是数字
SELECT * FROM **** WHERE trim(字段名) REGEXP '[^0-9]'=1
DELETE t1 FROM invest_year t1, invest_year t2 WHERE t1.pro_id = t2.pro_id AND t1.pro_year = t...
select count(id),字段from 表名 group by字段 having count(字段)>1;...
SELECT * FROM shop_count WHERE DATE(count_date)=current_date(); SELECT * FROM sho...
mysql -h ***.***.***.*** -P 3306 -u root -pmysqldump -h ***.***.***.*** -P 3...
SELECT * from system_user LIMIT 60,20limit是设置分页的关键他可以控制数据输出偏移SELECT column_name,column_name FR...
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...