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。
我有一个包含订单的表格和一个包含材料(1:N)的表格。我想知道某个生产订单和国家/地区的材料表中有多少订单有屏幕。底部的查询给出了每个订单的每个订单的屏幕数量,而不是预期的结果5:1 2FROM Orders AS ORDINNERJOIN Material AS KP ON KP.Ordernummer = ORD.Ordernummer
WHERE (KP.SOORT = 'SCREE
(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
我在hashtag和post table之间有很多对多的关系。SELECT hashtag_id, count(hashtag_id) as countwhere # group them and sort by count, so the must repeated hashtag is the best relative h
SQL很长,但这里是主要部分: SELECT COUNT(products.id) as products_count, property_items.description, property_items.idas idINNERJOIN product_properties ON property_items.id = product_properties.property_item_idINNERJOIN products ON pro
我正在尝试选择我拥有的数据库,但是当我尝试根据表中的一列group by id中的一列来显示count时,我遇到了问题。下面是我尝试过的查询: SELECT * , SELECT COUNT((DISTINCT daftar.id_daftar) group by daftar.id_kelas) AS CountFROM kelas
) as petowner from stores innerjoin owners on owners.id = stores.id innerJOIN pets on pets.owner =(DISTINCT pets.owner) as petowner from stores innerjoin owners on owners.id = stores.id innerJOIN pets, count(DISTINC