計數和ROWNUMBER

Question

SAMPE表：

CusID Order  Status 
3001 Hotdog Paid 
3001 Sausage Paid 
3001 Burger Unpaid 
3002 Sausage Paid 
3003 Burger Paid 
3003 Hotdog Paid 
3002 Hotdog Paid 
3001 Burger Paid 
3002 Burger Unpaid 

期望輸出繼電器

Row CusID NumOfOrdersPaid 
1  3001 3 
2  3002 2 

我嘗試這樣做：

SELECT * 
FROM (
    SELECT row_number() OVER (
     ORDER BY CusID 
    ) row 
    ,count(CASE STATUS 
     WHEN 'Paid' 
      THEN 1 
     ELSE NULL 
     END) AS NumOfOrdersPaid 
    FROM Orders 
) X 
WHERE x.r BETWEEN 1 
    AND 2 
GROUP BY CusID 

Answer 1

Select * from  
(Select CusID,row_number() over (order by CusID) r, 
count(case Status when 'Paid' then 1 else null end) 
AS NumOfOrdersPaid from Table1 Group By CusID) X 
where x.r between 1 and 2; 

fiddle

Answer 2

SELECT * FROM (SELECT ROW_NUMBER() OVER (ORDER BY CusID ASC) AS Row, CusID, NumOfOrdersPaid FROM MyTable) As List