SQL Server查詢問題（計數可能？）

Question

我有以下查詢：

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 

返回的結果集，看起來像這樣：

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

我想是這樣返回的東西代替（示出的每一批盒的總量）：

shipment_id，箱計數，shipment_status
101，3個，2
102，2,2
103,2 2

我該如何實現這個目標？

謝謝！

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 

只是需要從GROUP BY刪除box_id，並使用COUNT，正如你在標題說。

Answer 2

試試這個：

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