(distinct(l.visitor_id)) from `logs` l join info i on (i.id_no = l.visitor_id) where i.`name` = 'CUSTOMER' and l.visitor_id=i.id_no) as total_customer, (select count(l.visitor_id) from `logs` l join info i on (i.id_no = l.visitor_id) where i.`name` = 'vip
select orders.CustomerID, customers.ContactName , count(*) left join customers on Customers.CustomerID= Orders.customerid
group by Orders.customerid; 如果可能的话,请解释一下我的缺点。
JOIN countries on countries.region_id = regions.region_idGROUP BY regions.name;
CREATE TABLE region2 AS SELECT regions.name,count(countries.country_id) FROM regions RIGHT OU
我试图运行这样的查询: comment_type_id, name, count(comment_type_id) comments, commenttypesWHERE GROUP BY 如果没有comments和commenttypes之间对name列的连接,我可以使用以下方法来完成:
session.query(Comment.comment_type_id,func.
我有一个带有订单号列和行号列的表。下面的select语句返回我想要的值。我想获取结果,并将该数字插入到与订单号匹配的同一表中的一个列中。我是不是想太多了?或者在思考复杂性的时候?:) ORDNUM, COUNT(LINNUM) AS 'CountLines' WHERE STS = '3' ANDDUEQTY < ONHAND AND STYPE = 'CU'
GROUP BY ORDNU