根据 Oracle SQL 中的日期逻辑提取数据

Question

I need to extract the data from Oracle DB and this is the business requirement:

1. On Sunday and Monday, need to extract data as of previous Thursday
2. From Tuesday to Saturday, need to extract data as of (Date column -2)

Need assistance on where clause logic.

Answer 1

This is not an answer.

1. Is Monday, Tuesday as the day when query is run or something else?
2. On Tuesday the query should extract all those records where the date column matches two days before today? Can you provide sample data and expected result?

Answer 2

That would be

select *
from your_table
where date_column = 
  case when to_char(sysdate, 'dy') in ('sun', 'mon') then next_day(trunc(sysdate) - 7, 'thu')
       else trunc(sysdate) - 2
  end;