SQL Server查询问题(可能计数？)

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

我希望返回这样的东西(显示每次装运的总箱数):

shipment_id,盒子计数,shipment_status
101,3个,2
102,2,2
103,2,2

我怎么做到这一点？

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

只需要删除box_id从GROUP BY和使用COUNT,为您在您的标题说.