将行转换为列时摆脱NULL行

Question

我有以下SQL代码：

SELECT TOP (1000) 
  a.[JourneyNumber]
  ,a.[JourneyDate]
  ,a.[tReg_ID]
  ,a.[Reg]
  ,a.[ID]
  ,b.tLocationPosition_ID
  ,c.LifeCode
  ,c.LifeTotal

  ,CASE WHEN c.LifeCode LIKE 'LCF1' AND b.tLocationPosition_ID = 1 THEN c.LifeTotal END as ALCF1
  ,CASE WHEN c.LifeCode LIKE 'LCF1' AND b.tLocationPosition_ID = 2 THEN c.LifeTotal END as BLCF1
FROM [RALNHVTST].[dbo].[tRegJourney] as a

LEFT JOIN [RALNHVTST].[dbo].[tRegJourneyLogBook] as b
ON a.ID = b.tRegJourney_ID

LEFT JOIN [RALNHVTST].[dbo].[tRegJourneyLogBookLifeCodeEvents] AS c
ON b.ID = c.tRegJourneyLogBook_ID

WHERE b.tLocation_ID = 720
AND a.tReg_ID = 73 OR a.tReg_ID = 38
AND (b.tLocationPosition_ID = 1 OR b.tLocationPosition_ID = 2)
AND (c.LifeCode LIKE 'LCF1' )
ORDER BY JourneyDate    

在SELECt语句中，我试图将主要包含相同信息的多行转换为列。

所以这样：

JourneyNo JourneyDate       Reg    ID   tLocationPos_ID LifeCodeLifeTotal
4A  2015-08-31 00:00:00.000 OO-NSN  45023   1   LCF1    68.0000
4A  2015-08-31 00:00:00.000 OO-NSN  45023   2   LCF1    67.0000

成为此：

JourneyNumber   JourneyDate Reg      ID LifeCode    ALCF1   BLCF1
4A  2015-08-31 00:00:00.000 OO-NSN  45023   LCF1    68.0000 67.000

但是我却得到了这个：

JourneyNumber   JourneyDate    Reg       ID     LifeCode        ALCF1   BLCF1
4A  2015-08-31 00:00:00.000      OO-NSN 45023      LCF1         68.0000 NULL
4A  2015-08-31 00:00:00.000      OO-NSN 45023      LCF1         NULL    67.0000

有人可以帮我解决这个问题吗？

谢谢！

Answer 1

使用汇总

SELECT TOP (1000) 
  a.[JourneyNumber]
  ,a.[JourneyDate]
  ,a.[tReg_ID]
  ,a.[Reg]
  ,a.[ID]
  ,b.tLocationPosition_ID
  ,c.LifeCode
  ,c.LifeTotal

  ,max(CASE WHEN c.LifeCode LIKE 'LCF1' AND b.tLocationPosition_ID = 1 THEN c.LifeTotal END) as ALCF1
  ,max(CASE WHEN c.LifeCode LIKE 'LCF1' AND b.tLocationPosition_ID = 2 THEN c.LifeTotal END) as BLCF1
FROM [RALNHVTST].[dbo].[tRegJourney] as a

LEFT JOIN [RALNHVTST].[dbo].[tRegJourneyLogBook] as b
ON a.ID = b.tRegJourney_ID

LEFT JOIN [RALNHVTST].[dbo].[tRegJourneyLogBookLifeCodeEvents] AS c
ON b.ID = c.tRegJourneyLogBook_ID

WHERE b.tLocation_ID = 720
AND a.tReg_ID = 73 OR a.tReg_ID = 38
AND (b.tLocationPosition_ID = 1 OR b.tLocationPosition_ID = 2)
AND (c.LifeCode LIKE 'LCF1' )
group by  a.[JourneyNumber]
  ,a.[JourneyDate]
  ,a.[tReg_ID]
  ,a.[Reg]
  ,a.[ID]
  ,b.tLocationPosition_ID
  ,c.LifeCode
  ,c.LifeTotal
ORDER BY JourneyDate