Subject LEFT OUTER JOIN speed on a simple query
Author SoftTech
Greetings All,

The following query takes over 9 seconds:

SELECT DISTINCT CAST(0 AS SMALLINT) AS SELECTED,
A.ADDR_ID,
A.ADDRESS1,
A.ADDRESS2,
Z.CITY,
Z.COUNTY_NAME AS COUNTY,
Z.STATE_CODE AS STATE,
A.ZIP_CODE_ID,
Z.ZIP_CODE,
A.ZIP_CODE_SUFFIX,
A.DEFAULT_ROS_TYPE,
A.NOTE,
CAST (0 AS SMALLINT) AS USPS_STANDARDIZED_IMAGE_INDEX,
A.USPS_STANDARDIZED_DATE,
A.USPS_STANDARDIZED_USER
FROM DEBTOR D
JOIN PER_ADDRESS PA ON PA.PERSON_ID = D.PERSON_ID
JOIN ADDRESS A ON A.ADDR_ID = PA.ADDR_ID
LEFT OUTER JOIN ZIP_CODE Z ON Z.ZIP_CODE_ID = A.ZIP_CODE_ID
WHERE D.ACCT_ID = 36813
AND PA.ADDR_ID <> 48399

Simply changing the LEFT OUTER JOIN to a JOIN is instant. The issue is
there are 203 addresses in the ADDRESS database that do not have the
ZIP_CODE_ID set.

Any ideas on how to speed this query up when using the LEFT OUTER JOIN?

Thanks,
Mike