I have a table as in sample below
| C1 | C2 | C3 | C4 |
r1 | a | b | c | 1 |
r2 | a | b | c | 2 |
r3 | c | s | d | 3 |
r4 | c | w | w | 4 |
r5 | c | r | w | 5 |
Here if we concatenate C1,C2 and C3 columns we see that r1 and r2 rows have same values (C4 is different). I want to Select such that r1 and r2 are dropped and only r3,r4 and r5 are selected.
Distinct cannot work since C4 is Unique and ‘Group By’ will retain one of the row.
I want an output as follows
| C1 | C2 | C3 | C4 |
r3 | c | s | d | 3 |
r4 | c | w | w | 4 |
r5 | c | r | w | 5 |
2
Answers
Just use
group by
and filter the groups by theircount
viahaving
:You can do:
Result:
See running example at db<>fiddle.