这是使用PIVOT
表运算符的等效版本:
SELECT *
FROM
(
SELECT
CASE
WHEN sumUnits > 0
THEN SumAvgRent / sumUnits ELSE 0
END AS Expr1,
Description,
Period
FROM temp
) t
PIVOT
(
AVG(Expr1)
FOR Period IN(Period1, Period2, Period3)
) p;
例如,这将为您提供:
| DESCRIPTION | PERIOD1 | PERIOD2 | PERIOD3 |
---------------------------------------------
| D1 | 10 | 0 | 20 |
| D2 | 100 | 1000 | 0 |
| D3 | 50 | 10 | 2 |
使用MS sql ServerPIVOT
表运算符时,必须输入数据透视列的值。然而,在MS Access,这是该作品是TRANSFORM
用PIVOT
做的,这是动态获取枢转列的值。在这种情况下,您必须与PIVOT
操作员一起动态地执行此操作,如下所示:
DECLARE @cols AS NVARCHAR(MAX);
DECLARE @query AS NVARCHAR(MAX);
SELECT @cols = STUFF((SELECT distinct
',' +
QUOTENAME(Period)
FROM temp
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'');
SET @query = ' SELECT Description, ' + @cols + '
FROM
(
SELECT
CASE
WHEN sumUnits > 0
THEN SumAvgRent / sumUnits ELSE 0
END AS Expr1,
Description,
Period
FROM temp
) t
PIVOT
(
AVG(Expr1)
FOR Period IN( ' + @cols + ')
) p ';
Execute(@query);
这应该给您相同的结果:
| DESCRIPTION | PERIOD1 | PERIOD2 | PERIOD3 |
---------------------------------------------
| D1 | 10 | 0 | 20 |
| D2 | 100 | 1000 | 0 |
| D3 | 50 | 10 | 2 |