What should be count?

Question

hello experts,
i am using following code:
SELECT COUNT(*) FROM STR_ITEM_TRNS WHERE EXISTS( SELECT 'X' FROM STR_ITEM_TRNS
WHERE STR_ITEM_CODE ='223007572'
AND STR_LOCN_CODE=400001
AND STR_OWNR_LOCN='MS0010'
AND STR_TRNS_DATE>='31-JAN-12')
the out put of sub query i.e.
SELECT 'X' FROM STR_ITEM_TRNS
WHERE STR_ITEM_CODE ='223007572'
AND STR_LOCN_CODE=400001
AND STR_OWNR_LOCN='MS0010'
AND STR_TRNS_DATE>='31-JAN-12'
is as
Wrote file afiedt.buf
1 SELECT 'X' FROM STR_ITEM_TRNS
2 WHERE STR_ITEM_CODE ='223007572'
3 AND STR_LOCN_CODE=400001
4 AND STR_OWNR_LOCN='MS0010'
5* AND STR_TRNS_DATE>='31-JAN-12'
SQL> /
X
X
but out put of whole query is :
Wrote file afiedt.buf
1 SELECT COUNT(*) FROM STR_ITEM_TRNS WHERE EXISTS( SELECT 'X' FROM STR_ITEM_TRNS
2 WHERE STR_ITEM_CODE ='223007572'
3 AND STR_LOCN_CODE=400001
4 AND STR_OWNR_LOCN='MS0010'
5* AND STR_TRNS_DATE>='31-JAN-12')
SQL> /
COUNT(*)
260879
whyyyyyy?
please let me clear it ?
as i know it should be 1.
thanks yash

Answer 1

1. There is no Index on table.
2. there 260881 records.
I ALSO tryed to update record by cursor as:
declare
cursor c is select str_ownr_locn from str_item_trns WHERE STR_ITEM_CODE IN('223007572','223008511','223009232','223010258','223010275','299102065','299102094','299102095')
AND STR_LOCN_CODE=400001
AND STR_OWNR_LOCN='MS0010'
AND trunc(STR_TRNS_DATE)>=to_date('31-JAN-2012','dd-mm-yyyy')
for update of str_ownr_locn;
begin
for i in c loop
update str_item_trns set str_ownr_locn='MS0012'
WHERE CURRENT OF C;
END LOOP;
END;
NUT ITS ALSO WAITING LONG TIME.
Thanks
yash
Edited by: yash_08031983 on Feb 6, 2012 2:13 AM
Edited by: yash_08031983 on Feb 7, 2012 3:00 AM