Hi all,
I need ur help regarding the optimization of following
query. If possible pls reply asap.
Thankz a ton in advance.
SELECT company_name,coupon_id,coupon_title, city_name,
category_name, NVL(person_name,' ') person_name,
NVL (locality_name,' ') locality_name,
NVL(company_address,' ') company_address,
NVL(mobile_no,' ') mob,
NVL(company_phone1,' ') ph1,
NVL(company_phone2,' ') ph2,
psid_1,discount1,
NVL(psid_2,-1) p2,
NVL(discount2,-1) d2,
NVL(psid_3,-1) p3,
NVL(discount3,-1) d3,
TO_CHAR(expiry_date,'dd-mm-yyyy')expdate,
REDEMPTION_METHOD, PICTURE_FILE_NAME,
NVL(company_info,' ') company_info
FROM TBL_MCP_COUPON a, TBL_MCP_LOCALITY, TBL_MCP_CITY,
TBL_MCP_CATEGORY
WHERE (verify='Y' OR verify='R')
AND ROWNUM <= 10 AND (SYSDATE <= EXPIRY_DATE)
AND a.city_id=4
AND a.category_id=10
AND a.category_id=TBL_MCP_CATEGORY.category_id
AND a.locality_id=TBL_MCP_LOCALITY.locality_id
AND a.city_id=TBL_MCP_CITY.city_id
--check for with and without following two lines ,
becouse these lines will be included in query
conditionally
--AND a.locality_id=25
--AND (psid_1=113 OR psid_2=113 OR psid_3=113)
AND a.coupon_id NOT IN
( SELECT a.coupon_id FROM
TBL_MCP_USERCOUPONS b,TBL_MCP_COUPON a
WHERE a.coupon_id=b.coupon_id AND a.REDEMPTION_METHOD
= 1 AND b.MIN= 1234567891)
ORDER BY LOWER(company_name);
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