1
,我从检索数据的数据库具有表结构这样逆透视主场迎战联盟查询在T-SQL 2008
表:ClientSales
ClientSalesId int identity (1, 1) (PK)
ClientId int (FK)
TermId int (FK)
StudentType1Population int
StudentType1Adjustment int
StudentType1Sales int
StudentType1SalesAdjustment int
StudentType2Population int
StudentType2Adjustment int
StudentType2Sales int
StudentType2SalesAdjustment int
StudentType3Population int
StudentType3Adjustment int
StudentType3Sales int
StudentType3SalesAdjustment int
StudentType4Population int
StudentType4Adjustment int
StudentType4Sales int
StudentType4SalesAdjustment int
StudentType5Population int
StudentType5Adjustment int
StudentType5Sales int
StudentType5SalesAdjustment int
我要显示它在一份报告中unpivot操作如下
对于客户端Id = 1和期限ID = 1
Population PopulationAdjustment Sales SalesAdjustment StudentType1 313 18 123 22 StudentType2 233 14 156 33 StudentType3 234 12 112 41 StudentType4 233 13 198 29 StudentType5 343 10 134 36
我能做到这两个方面
SELECT
'StudentType1' as DemographicType
StudentType1Population as Population,
StudentType1Adjustment as PopulationAdjustment,
StudentType1Sales as Sales,
StudentType1SalesAdjustment as SalesAdjustment,
FROM ClientSales
WHERE 1=1
AND ClientId = 1
AND TermId = 1
UNION
SELECT
'StudentType2' as DemographicType
StudentType2Population as Population,
StudentType2Adjustment as PopulationAdjustment,
StudentType2Sales as Sales,
StudentType2SalesAdjustment as SalesAdjustment,
FROM ClientSales
WHERE 1=1
AND ClientId = 1
AND TermId = 1
-- yada yada yada for the rest of the types...........
OR
SELECT
ClientId,
Population
FROM
(
SELECT
ClientId,
StudentType1Population,
StudentType2Population,
StudentType3Population,
StudentType4Population,
StudentType5Population
FROM ClientSales
) PVTPopulation
UNPIVOT
(
Population for StudentType IN
(
StudentType1Population,
StudentType2Population,
StudentType3Population,
StudentType4Population,
StudentType5Population
)
) as UnPvtPopulation
INNER JOIN
(
SELECT
ClientId,
StudentType1PopulationAdjustment,
StudentType2PopulationAdjustment,
StudentType3PopulationAdjustment,
StudentType4PopulationAdjustment,
StudentType5PopulationAdjustment
FROM ClientSales
) PVTPopulation
UNPIVOT
(
PopulationAdjustment for StudentType IN
(
StudentType1PopulationAdjustment,
StudentType2PopulationAdjustment,
StudentType3PopulationAdjustment,
StudentType4PopulationAdjustment,
StudentType5PopulationAdjustment
)
) as UnPvtPopulationAdjustment
ON UnPvtPopulationAdjustment.ClientSalesId = UnPvtPopulation.ClientSalesId
AND REPLACE (UnPvtPopulationAdjustment.StudentType, 'PopulationAdjustment', '') = REPLACE (UnPvtPopulation.StudentType, 'Population', '')
INNER JOIN
(
SELECT
ClientId,
StudentType1Sales,
StudentType2Sales,
StudentType3Sales,
StudentType4Sales,
StudentType5Sales
FROM ClientSales
) PVTSales
UNPIVOT
(
Sales for StudentType IN
(
StudentType1Sales,
StudentType2Sales,
StudentType3Sales,
StudentType4Sales,
StudentType5Sales
)
) as UnPvtSales
ON UnPvtSales.ClientSalesId = UnPvtPopulation.ClientSalesId
AND REPLACE (UnPvtSales.StudentType, 'Sales', '') = REPLACE (UnPvtPopulation.StudentType, 'Population', '')
所以这里的问题:
- 作为最佳实践,我应该使用UNPIVOT或UNION
- 有没有更好的方法来写这个UNPIVOT?