Question

I want to select all rows that have a value that already exists in the table. I did not find a better solution than

select * 
from provisioning_requests tt 
where code in (select code 
               from provisioning_requests tt2 
               where tt2.id <> tt.id)

This seems a bit naive. Does anybody have a better solution?

Answer 1

select * 
from provisioning_requests t1
 join (select code from provisioning_requests group by code having count(*)>1) t2
 ON t1.code = t2.code

OR

select * 
from provisioning_requests
 WHERE code in (select code from provisioning_requests group by code having count(*)>1)