如何从比较表达式中提取比较器的指定字段

Question

I have a SQL like " where age = 1 and name = 'xxx' and ds >= '2021-11-11', how to extact the comparison of field 'ds', like ds > '2021-11-11'?

even more, i need to analyze complex sql like: where age = 2 and ( ds = '2021-11-11' or name = 'xxx' ) or ds = '2021-12-12'.

is there a algorithm or code help me?

Answer 1

Does something like this work for you?

select a,b,..., 
   iif(ds > '2021-11-11', 
      'ds is greater', 
       iif(ds = '2021-11-11', 'ds is equal', 'ds is less')) as 'ds_compare'