查询#1 (使用左连接):LEFT JOIN catalog_product_category_bindings AScpcbWHERE cpcb.categoryID IS NULLSELECT cp.* FROM catalog_productsAS cp(SELECT productID FROM catalog_product_category
delimiter /create procedure piez_vend (IN _piez varchar(20), out nvend int(11))SELECT numpieza, count(numvend) into nvend from preciosum where numpieza like _piez;/样本数据
numpieza, numvend, p
md5(uniqid(rand(), true)9a423553ce53c4d7a6199fa9254bfdc5SELECT * FROM table WHERE id = 9a423553ce53c4d7a6199fa9254bfdc5Unknown column '9a423553ce53c4d7a6199fa9254bfdc5