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;
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 * FROM shop_count WHERE DATE(count_date)=current_date(); SELECT * FROM sho...
DATE_ADD(now(),INTERVAL 1 DAY);...
in 或者out 参数 :需要设定长度,否则保存的时候会报错;参数和字段名重名的时候,为了区别字段名,需要在字段前面加入表名创建临时表CREATE TEMPORARY TABLE&...
减去一天SELECT DATE_SUB(CURDATE(), INTERVAL 1 DAY);减去一个小时hour(now())-1...