重复声明

Question

我需要一个关于While语句的帮助，我之前从未使用过一个，并且想知道在我击中目标之前必须修复序列：

例如

1
2
3
4
1
2
3
4
Until 5000

我曾试图写自己的但却陷入困境：

USE Occupancy
CREATE TABLE Bookings2
(Booking_Skey   INT IDENTITY (1,1) not null,
PitchType_Skey  INT  not null)

DECLARE @PitchType_Skey INT
SET @PitchType_Skey = 1
WHILE (@PitchType_Skey <= 4)

BEGIN
INSERT INTO Bookings2(PitchType_Skey)
SELECT @PitchType_Skey
SET @PitchType_Skey = @PitchType_Skey + 1
END

Answer 1

用

替换你的选择

SELECT (CASE WHEN @PitchType_Skey % 4 = 0 THEN 4 ELSE @PitchType_Skey % 4 END)

％是模数或余数，因此它获得@PitchType_Skey / 4的剩余部分（保证小于4的值）

然后你必须用4替换0

WHILE (@PitchType_Skey <= 5000)
BEGIN
  INSERT INTO Bookings2(PitchType_Skey)
  SELECT (CASE WHEN @PitchType_Skey % 4 = 0 THEN 4 ELSE @PitchType_Skey % 4 END)
  SET @PitchType_Skey = @PitchType_Skey + 1
END

Answer 2

你实际上不需要一段时间，因为你可以使用master..spt_values

WITH t1250
     AS (SELECT TOP 1250 Row_number() 
                           OVER( 
                             ORDER BY t1.number) AS N 
         FROM   master..spt_values t1 
                CROSS JOIN master..spt_values t2) 
INSERT INTO Bookings2
      (PitchType_Skey)

SELECT v.number 
FROM   master..spt_values v 
       CROSS JOIN t1250
WHERE  v.type = 'P' 
       AND v.number > 0 
       AND v.number < 5

Demo

或使用Moduls作为msmucker0527 did

WITH t5000
     AS (SELECT TOP 5000 Row_number() 
                           OVER( 
                             ORDER BY t1.number) AS N 
         FROM   master..spt_values t1 
                CROSS JOIN master..spt_values t2) 
INSERT INTO Bookings2
   (PitchType_Skey)
SELECT 
      CASE WHEN n % 4 = 0 THEN 4 ELSE n % 4 END
FROM t5000 

Demo