Question

我有以下查询：

SELECT  A.shipment_id
        ,B.box_id
        ,A.shipment_status
FROM shipments A
join boxes B on A.shipment_id = B.shipment_id
where A.shipment_status = 2
Group by B.box_id, A.shipment_id, A.shipment_status

返回一个如下所示的结果集：

shipment_id ， box_id ， shipment_status
101，boxA，2
101，boxB，2
101，boxC，2
102，box101,2 102，box102,2 103，boxA1,2 103，boxA2,2

我想返回这样的东西（显示每次发货的总箱数）：

shipment_id ，包装箱数， shipment_status
101,3,2 102,2,2 103,2,2

我将如何实现这一目标？

谢谢！

Answer 1

SELECT  A.shipment_id
        ,COUNT(*) AS boxcount
        ,A.shipment_status
FROM shipments A
join boxes B on A.shipment_id = B.shipment_id
where A.shipment_status = 2
Group by A.shipment_id, A.shipment_status

只需要从box_id中移除GROUP BY并使用COUNT，就像您在标题中所说的那样。

Answer 2

试试这个：

SELECT  A.shipment_id
    , count(1)
    , A.shipment_status
  FROM shipments A
  join boxes B on A.shipment_id = B.shipment_id
 where A.shipment_status = 2
 Group by A.shipment_id, A.shipment_status

SQL Server查询问题（可能计数？）

2 个答案: