I have a little problem, my query look like this
select count(A.toto)
from B
inner join C
on B.tata = C.tata
inner join A
on C.tutu = A.tutu
group by A.toto, A.zaza, A.zozo;
and my result look like this :
1
2
1
6
7
4
1
1
1
But I want only the number of rows, for this example, the value that I would like to have is 9. But I don't know how I can have this value... Thank you in advance !!
You can use count(distinct). Unfortunately, Oracle doesn't support count(distinct) with multiple arguments, so a typical method is just to concatenate the value together:
select count(distinct A.toto || ':' || A.zaza || ':' || A.zozo)
from B inner join
C
on B.tata = C.tata inner join
A
on C.tutu = A.tutu;
This assumes that. the column values don't have the separator character (or at least in such a way that the concatenation is the same for rows with different key values).
An alternative method is to use a subquery:
select count(*)
from (select 1
from B inner join
C
on B.tata = C.tata inner join
A
on C.tutu = A.tutu
group by A.toto, A.zaza, A.zozo
) abc
