Oracle, Web, Script, SQLserver, Tips & Trick

January 6, 2010

oracle sql tuning (not in)

Filed under: oracle — sikathabis @ 4:06 am
Tags: , ,

ORIGINAL TEXT

SELECT *
FROM dbadmin.ln_master
WHERE kd_sts_rek = ’01’ AND no_rek NOT IN

(

SELECT no_rek
FROM dbadmin.ln_master_bas2

)

SQL TUNING

SELECT /*+ FIRST_ROWS(30) */ *
FROM dbadmin.ln_master
WHERE kd_sts_rek = ’01’
AND no_rek IN

(

SELECT no_rek
FROM dbadmin.ln_master
MINUS
SELECT no_rek
FROM dbadmin.ln_master_bas2
GROUP BY no_rek

)

The difference are

1. SELECT * –> SELECT /*+ FIRST_ROWS(30) */ *

2. AND no_rek NOT IN –> AND no_rek IN

3. SELECT no_rek FROM dbadmin.ln_master_bas2 –> SELECT no_rek FROM dbadmin.ln_master MINUS SELECT no_rek FROM dbadmin.ln_master_bas2 GROUP BY no_rek

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