Question

I’m trying to keep only rows where an ID has a single sales date, eg.

ID SALES_DTE
101 10-Jan-12
101 10-Jan-12
101 10-Jan-12
102 10-Jan-12
102 13-Jan-12
103 13-Jan-12

In the above, I want to keep IDs 101 and 103, because they only have one sales date. But I don’t want 102 because it has two sales dates. Can anyone help?

Answer 1

delete from your_table
where id not in 
(
   select id
   from your_table
   group by id
   having count(distinct sales_date) = 1
)