Count和RowNumber

Question

样本表：

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

期望输出

Row    CusID   NumOfOrdersPaid
1      3001    3
2      3002    2

我试过了：

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