How to get count and other field in one select

Question

Hi,
I am try to get total rows and some fields in two separate select:
1. select count(id) into totalRows from mytable m where m.cat = 'CSV'
2. select m.id, m.cat, m.updateTime from mytable m where m.cat = 'CSV'
(all rows in mytable are distinct base on id field)
How can I combine them into one query to make it faster so that no need to compare the m.cat field twice?
Thanks.
David

Answer 1

Here's one solution :
SQL> desc test;
Name Null? Type
ID NUMBER
CAT VARCHAR2(10)
UPDATE_TIME TIMESTAMP(6)
SQL> select * from test;
ID CAT UPDATE_TIME
1 XYZ 09-JAN-04 09.04.17.000000 AM
2 CSV 09-JAN-04 09.04.31.000000 AM
4 ABCD 09-JAN-04 09.04.41.000000 AM
5 CSV 09-JAN-04 09.04.53.000000 AM
6 ABC 09-JAN-04 09.05.00.000000 AM
7 CSV 09-JAN-04 09.05.06.000000 AM
8 GGG 09-JAN-04 09.05.17.000000 AM
7 rows selected.
SQL> select id, cat, update_time
2 ,Count(*) Over (Order By cat) As TotCnt
3 from test
4 Where cat = 'CSV'
5 /
ID CAT UPDATE_TIME TOTCNT
2 CSV 09-JAN-04 09.04.31.000000 AM 3
5 CSV 09-JAN-04 09.04.53.000000 AM 3
7 CSV 09-JAN-04 09.05.06.000000 AM 3
SQL>
-- Shailender Mehta -