检查字符串值

Question

我想在SQL中加入if语句,确定字符串的值是否等于""(我不是指一个空字符串 - 我的意思是一个两个引号的字符串).我怎样才能做到这一点.我希望SQL看起来像这样:

Select iif(Answer="","No Response", Answer)
From tblAnswers

Answer 1

SELECT CASE
       WHEN Answer = '""' THEN 'No Response'
       ELSE Answer
       END AS Answer
  FROM tblAnswers