SQL CASE statement(SQL CASE 语句)

本文介绍了SQL CASE 语句的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有以下查询，我想将它们放在 sql CASE 语句中，因此我只有一个查询，但我不知道该怎么做.有人可以帮我吗?

I have the following queries and I want to put them in an sql CASE statement so I would have only one query but I don't know how to do that. Can somebody help me?

IF (SELECT EtlLoadId 
 FROM  ssislogs.audit.processcontrol 
 WHERE SubjectArea = 'UaqaFacetsImp') > 0
SELECT pc.SrcFileName + ' - '+  CONVERT(VARCHAR(10), pc.[RecordCount] ) AS FacetsImpCount
 FROM  ssislogs.audit.processcontrol pc left outer join
 Uaqa.LettersAndCardsExports lc
on pc.etlloadid = lc.etlloadid
  WHERE pc.subjectarea = 'UaqaFacetsImp'
ELSE
SELECT 'No input file' AS FacetsImpCount

<小时>

SELECT pc.subjectarea AS FacetsRjctFile
FROM  ssislogs.audit.processcontrol pc left outer join
Uaqa.LettersAndCardsExports lc
on pc.etlloadid = lc.etlloadid
  WHERE pc.subjectarea = 'UaqaFacetsRjct'

<小时>

SELECT pc.subjectarea AS FacetsPvsFile
FROM  ssislogs.audit.processcontrol pc left outer join
Uaqa.LettersAndCardsExports lc
on pc.etlloadid = lc.etlloadid
  WHERE pc.subjectarea = 'UaqaFacetsPvs'

谢谢

推荐答案

UNION-Query 可能会有所帮助:

Propably a UNION-Query will help:

SELECT  'FacetsRjctFile' as Type, pc.subjectarea
FROM  ssislogs.audit.processcontrol pc left outer join
Uaqa.LettersAndCardsExports lc
on pc.etlloadid = lc.etlloadid
  WHERE pc.subjectarea = 'UaqaFacetsRjct'

UNION

SELECT 'FacetsPvsFile' as Type, pc.subjectarea
FROM  ssislogs.audit.processcontrol pc left outer join
Uaqa.LettersAndCardsExports lc
on pc.etlloadid = lc.etlloadid
  WHERE pc.subjectarea = 'UaqaFacetsPvs'

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