WHERE子句中case语句中的语法错误“ Missing keyword”

Question

我在case条件语句中检查以下条件时出现语法错误：

((RAP10B.CLMSRC = '2', RAP01.EFFDT - 3 years <= RAP10.LOSSDT < RAP01.EFFDT) 
       OR 
(RAP10B.CLMSRC <> '2', RAP01.EFFDT - 3 years <= RAP10.LOSSDT < RAP01.EFFDT - 60 days)

下面是我正在使用的代码。

CASE
  WHEN RAP10B.CLMSRC = '2'
  THEN rap10.lossdt_t BETWEEN Add_months(rap01.teffdt_t, - 36) AND rap01.teffdt_t
  WHEN RAP10B.CLMSRC <> '2'
  THEN rap10.lossdt_t BETWEEN Add_months(rap01.teffdt_t, - 36) AND (rap01.teffdt_t - 60)
END 

错误消息是“ ORA-00905：缺少关键字”。 但是我找不到丢失的东西。

Answer 1

通常，最好在WHERE子句中使用AND / OR构造而不是case 表达式 ：

WHERE (RAP10B.CLMSRC = '2'
       AND rap10.lossdt_t BETWEEN Add_months(rap01.teffdt_t, - 36) AND rap01.teffdt_t)
   OR (RAP10B.CLMSRC <> '2'
       AND rap10.lossdt_t BETWEEN Add_months(rap01.teffdt_t, - 36) AND (rap01.teffdt_t - 60))

Answer 2

您是否正在寻找这样的东西？

CASE
   WHEN RAP10B.CLMSRC = '2'
      AND rap10.lossdt_t BETWEEN Add_months(rap01.teffdt_t, - 36) 
      AND rap01.teffdt_t THEN <your_column>
   WHEN RAP10B.CLMSRC <> '2'
      AND rap10.lossdt_t BETWEEN Add_months(rap01.teffdt_t, - 36) 
      AND (rap01.teffdt_t - 60) THEN <your_column>
END 

Answer 3

尝试以下-

CASE
  WHEN RAP10B.CLMSRC = '2'
  and rap10.lossdt_t BETWEEN Add_months(rap01.teffdt_t, - 36) AND rap01.teffdt_t then yourval
  WHEN RAP10B.CLMSRC <> '2'
  and rap10.lossdt_t BETWEEN Add_months(rap01.teffdt_t, - 36) AND (rap01.teffdt_t - 60) yourval1
END