如何在SQL Server中填充日期維度表，以便獲得具有此特定值的列？

Question

我在SQL Server 2014中運行以下查詢，以填充名為DateDimension的表。

DECLARE @startdate datetime
   DECLARE @enddate datetime
SET @startdate = '01/01/2000'
   SET @enddate = '12/31/2018'
DECLARE @loopdate datetime
   SET @loopdate = @startdate
WHILE @loopdate <= @enddate
   BEGIN
INSERT INTO DateDimension VALUES (
   Day(@loopdate),
   Month(@loopdate), 
   Year(@loopdate), 
   CASE WHEN Month(@loopdate) IN (1, 2, 3) THEN 3 -- Since Financial Year starts in July, January to March is considered as Quarter 3
   WHEN Month(@loopdate) IN (4, 5, 6) THEN 4
   WHEN Month(@loopdate) IN (7, 8, 9) THEN 1
   WHEN Month(@loopdate) IN (10, 11, 12) THEN 2
   END,
   @loopdate,
   CONVERT(VARCHAR(10),@loopdate,111) 
   ) 

   SET @loopdate = DateAdd(d, 1, @loopdate)
   END

運行上述查詢后，當前表的提取如下：

id  Day Month   Year quarter    date        datevarchar
1   1   1       2000    3    2000-01-01       1/1/2000
2   2   1       2000    3    2000-01-02       1/2/2000
3   3   1       2000    3    2000-01-03       1/3/2000
4   4   1       2000    3    2000-01-04       1/4/2000
5   5   1       2000    3    2000-01-05       1/5/2000

我需要“季度”列來顯示其值，如下所示：

   quarter
  Qr 3 2000

如果將“ quarter”列保持原樣，並添加一個新列以顯示我要執行的操作，那就更好了。 我怎樣才能做到這一點？

Answer 1

在運行查詢之前，您需要先將該列添加到DateDimension表上。 這將是varchar（9）列。

DECLARE @startdate datetime
   DECLARE @enddate datetime
SET @startdate = '01/01/2000'
   SET @enddate = '12/31/2018'
DECLARE @loopdate datetime
   SET @loopdate = @startdate
WHILE @loopdate <= @enddate
   BEGIN
INSERT INTO DateDimension VALUES (
   Day(@loopdate),
   Month(@loopdate), 
   Year(@loopdate), 
   CASE WHEN Month(@loopdate) IN (1, 2, 3) THEN 3 -- Since Financial Year starts in July, January to March is considered as Quarter 3
   WHEN Month(@loopdate) IN (4, 5, 6) THEN 4
   WHEN Month(@loopdate) IN (7, 8, 9) THEN 1
   WHEN Month(@loopdate) IN (10, 11, 12) THEN 2
   END,
   @loopdate,
   CONVERT(VARCHAR(10),@loopdate,111),
   CASE WHEN Month(@loopdate) IN (1, 2, 3) THEN 'Qr 3 ' + CONVERT(VARCHAR(4),Year(@loopdate))
   WHEN Month(@loopdate) IN (4, 5, 6) THEN 'Qr 4 ' + CONVERT(VARCHAR(4),Year(@loopdate))
   WHEN Month(@loopdate) IN (7, 8, 9) THEN 'Qr 1 ' + CONVERT(VARCHAR(4),Year(@loopdate))
   WHEN Month(@loopdate) IN (10, 11, 12) THEN 'Qr 2 ' + CONVERT(VARCHAR(4),Year(@loopdate))
   END
   ) 

   SET @loopdate = DateAdd(d, 1, @loopdate)
   END