SQL查詢爲每個唯一客戶ID返回一個單一行

Question

Todays_Sales表中的所有列（ID，銷售人員，項目，類型）。

我目前的查詢結果顯示：

ID  Salesperson  Item Type   
--------------------------------------- 
75343 Mike Germain 3874 Credit   
75343 Ken Johnson  2590 Cash    
67850 Justin Anderson 6435 Check   
67850 Mike Germain 1228 Credit   

我希望我的查詢結果，而不是顯示：

ID  Salesperson 1 Item 1 Type 1 Salesperson 2 Item 2 Type 2 
---------------------------------------------------------------------- 
75343 Mike Germain 3874 Credit Ken Johnson  2590 Cash 
67850 Justin Anderson 6435 Check Mike Germain 1228 Credit 

Answer 1

試試這個：

WITH 
input(id,salesperson,item,type) AS (
      SELECT 75343, 'Mike Germain' ,3874,'Credit' 
UNION ALL SELECT 75343, 'Ken Johnson' ,2590,'Cash' 
UNION ALL SELECT 67850, 'Justin Anderson',6435,'Check' 
UNION ALL SELECT 67850, 'Mike Germain' ,1228,'Credit' 
) 
-- Common Table Expression above is just for data, don't use 
-- in real query 
, 
-- begin WITH clause with this if selecting from table 
input_w_seq AS (
SELECT 
    id 
, ROW_NUMBER() OVER(PARTITION BY id) AS seq 
, salesperson 
, item 
, type 
FROM input 
) 
SELECT 
    id 
, MAX(CASE seq WHEN 1 THEN salesperson END) AS salesperson_1 
, MAX(CASE seq WHEN 1 THEN item  END) AS item_1 
, MAX(CASE seq WHEN 1 THEN type  END) AS type_1 
, MAX(CASE seq WHEN 2 THEN salesperson END) AS salesperson_2 
, MAX(CASE seq WHEN 2 THEN item  END) AS item_2 
, MAX(CASE seq WHEN 2 THEN type  END) AS type_2 
FROM input_w_seq 
GROUP BY 
    id 
ORDER BY 
    id 
; 

id |salesperson_1 |item_1|type_1|salesperson_2|item_2|type_2 
67,850|Justin Anderson| 6,435|Check |Mike Germain | 1,228|Credit 
75,343|Mike Germain | 3,874|Credit|Ken Johnson | 2,590|Cash