Oracle SQL Developer question from newbie - sql

Question

Sorry could not think of more descriptive title. I have data that looks like:
MEMBERID
TICKETID
STATUS
A
123
Y
A
012
N
A
456
Y
B
XYZ
N
B
ABC
N
C
DEF
Y
C
789
Y
I want to separate the above into three tables:
(1) Members that ONLY have tickets with Status=Y
(2) Members that have mixed status tickets (so at least one ticket with status=Y and at least one ticket with status=N)
(3) Members that ONLY have tickets with Status=N
In Excel I would just do a pivot table that results in something like:
MEMBERID
"Y"
"N"
A
2
1
B
0
2
C
2
0
...then add a 4th column with a formula that allows me to separate member IDs by "Only Y", "Only N", and "Y/N". I'm new to SQL though, and can't seem to get "pivot" to run correctly, or maybe there's a "where" clause that could resolve this without using pivot? Help!

Answer 1

You could pivot but it's probably simpler to just do the aggregation yourself:
select memberid,
count(case when status = 'Y' then ticketid end) as y,
count(case when status = 'N' then ticketid end) as n
from your_table
group by memberid
order by memberid;
To get the fourth column you can either repeat the counts within another case expression:
select memberid,
count(case when status = 'Y' then ticketid end) as y,
count(case when status = 'N' then ticketid end) as n,
case
when count(case when status = 'Y' then ticketid end) > 0
and count(case when status = 'N' then ticketid end) > 0
then 'Y/N'
when count(case when status = 'Y' then ticketid end) > 0
then 'Only Y'
when count(case when status = 'N' then ticketid end) > 0
then 'Only N'
end as yn
from your_table
group by memberid
order by memberid;
Or put the initial query into a CTE or inline view which is clearer and has less repetition, so easier to maintain:
select memberid, y, n,
case
when y > 0 and n > 0 then 'Y/N'
when y > 0 then 'Only Y'
when n > 0 then 'Only N'
end as yn
from (
select memberid,
count(case when status = 'Y' then ticketid end) as y,
count(case when status = 'N' then ticketid end) as n
from your_table
group by memberid
)
order by memberid;
Either way you end up with:
MEMBERID Y N YN
-------- - - ------
A 2 1 Y/N
B 0 2 Only N
C 2 0 Only Y
SQL Fiddle