WHEN声明接连时声明

Question

我正在尝试使用double when语句但不确定如何执行此操作.这是我正在使用的代码

CASE WHEN dbo.CSEFExtWorkflowAbsences.Number41=1 THEN dbo.CSEFExtWorkflowAbsences.Text1
WHEN dbo.CSEFExtWorkflowAbsences.Number41=2 THEN dbo.CSEFExtWorkflowAbsences.Text2
WHEN dbo.CSEFExtWorkflowAbsences.Number41=3 THEN dbo.CSEFExtWorkflowAbsences.Text3
WHEN dbo.CSEFExtWorkflowAbsences.Number41=4 THEN dbo.CSEFExtWorkflowAbsences.Text4
WHEN dbo.CSEFExtWorkflowAbsences.Number41=5 THEN dbo.CSEFExtWorkflowAbsences.Text5
WHEN dbo.CSEFExtWorkflowAbsences.Number41=6 THEN dbo.CSEFExtWorkflowAbsences.Text6
WHEN dbo.CSEFExtWorkflowAbsences.Number41=7 THEN dbo.CSEFExtWorkflowAbsences.Text7
WHEN dbo.CSEFExtWorkflowAbsences.Number41=8 THEN dbo.CSEFExtWorkflowAbsences.Text8
WHEN dbo.CSEFExtWorkflowAbsences.Number41=9 THEN dbo.CSEFExtWorkflowAbsences.Text9
WHEN dbo.CSEFExtWorkflowAbsences.Number41=10 THEN dbo.CSEFExtWorkflowAbsences.Text10
WHEN dbo.CSEFExtWorkflowAbsences.Number41=11 THEN dbo.CSEFExtWorkflowAbsences.Text11
WHEN dbo.CSEFExtWorkflowAbsences.Number41=12 THEN dbo.CSEFExtWorkflowAbsences.Text12
WHEN dbo.CSEFExtWorkflowAbsences.Number41=13 THEN dbo.CSEFExtWorkflowAbsences.Text13
WHEN dbo.CSEFExtWorkflowAbsences.Number41=14 THEN dbo.CSEFExtWorkflowAbsences.Text14
WHEN dbo.CSEFExtWorkflowAbsences.Number41=15 THEN dbo.CSEFExtWorkflowAbsences.Text15
WHEN dbo.CSEFExtWorkflowAbsences.Number41=16 THEN dbo.CSEFExtWorkflowAbsences.Text16
WHEN dbo.CSEFExtWorkflowAbsences.Number41=17 THEN dbo.CSEFExtWorkflowAbsences.Text17
WHEN dbo.CSEFExtWorkflowAbsences.Number41=18 THEN dbo.CSEFExtWorkflowAbsences.Text18
WHEN dbo.CSEFExtWorkflowAbsences.Number41=19 THEN dbo.CSEFExtWorkflowAbsences.Text19
WHEN dbo.CSEFExtWorkflowAbsences.Number41=20 THEN dbo.CSEFExtWorkflowAbsences.Text20
ELSE 'N/A' END

我没有考虑到的是dbo.CSEFExtWorkflowAbsences.Text[xx]可以为null我想要做的是在我将使用另一个写入"查看附件" WHEN之后的每个语句中使用文本如果不为null.不知道如何写在.请得到照顾,当我尝试做一个或或接着用.THENWHEN ISNULLELSEisnullwhen isnullcase when isnullelse

Answer 1

为什么不在isnull周围case？您还可以使用case您在值而不是条件上选择的形式:

ISNULL(CASE dbo.CSEFExtWorkflowAbsences.Number41
  WHEN 1 THEN dbo.CSEFExtWorkflowAbsences.Text1
  WHEN 2 THEN dbo.CSEFExtWorkflowAbsences.Text2
  WHEN 3 THEN dbo.CSEFExtWorkflowAbsences.Text3
  WHEN 4 THEN dbo.CSEFExtWorkflowAbsences.Text4
  WHEN 5 THEN dbo.CSEFExtWorkflowAbsences.Text5
  WHEN 6 THEN dbo.CSEFExtWorkflowAbsences.Text6
  WHEN 7 THEN dbo.CSEFExtWorkflowAbsences.Text7
  WHEN 8 THEN dbo.CSEFExtWorkflowAbsences.Text8
  WHEN 9 THEN dbo.CSEFExtWorkflowAbsences.Text9
  WHEN 10 THEN dbo.CSEFExtWorkflowAbsences.Text10
  WHEN 11 THEN dbo.CSEFExtWorkflowAbsences.Text11
  WHEN 12 THEN dbo.CSEFExtWorkflowAbsences.Text12
  WHEN 13 THEN dbo.CSEFExtWorkflowAbsences.Text13
  WHEN 14 THEN dbo.CSEFExtWorkflowAbsences.Text14
  WHEN 15 THEN dbo.CSEFExtWorkflowAbsences.Text15
  WHEN 16 THEN dbo.CSEFExtWorkflowAbsences.Text16
  WHEN 17 THEN dbo.CSEFExtWorkflowAbsences.Text17
  WHEN 18 THEN dbo.CSEFExtWorkflowAbsences.Text18
  WHEN 19 THEN dbo.CSEFExtWorkflowAbsences.Text19
  WHEN 20 THEN dbo.CSEFExtWorkflowAbsences.Text20
  ELSE 'N/A'
END, 'See attachment')