从sql server中的查询获取元数据

示例查询

  select a.Col1 ,b.col2 ,case when a.col3 = 'abc' then b.col4 else a.col5 end 
  from tablea A
  join tableb B on a.col6 = b.col7
  where a.col8 = '123'

所需输出:

Tables  Column  usage
TableA  Col1    select
TableB  Col2    select
TableA  Col3    select
TableB  Col4    select
TableA  Col5    select
TableA  Col6    Join
TableB  Col7    join
TableA  Col8    where