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Top Forums Programming How to eliminate OR clause when joining tables? Post 302962177 by Perlbaby on Wednesday 9th of December 2015 11:39:43 AM
Old 12-09-2015
How to eliminate OR clause when joining tables?

HI Team

I have q tricky question when joining 3 tables in Teradata DB.In the last line of my query , I am comparing one condition with C an B tables and its creating performance issue in returning the data . Basically I want to eliminate OR clause and try other approach.Is there any logic to satisfy this condition . Thanks in advance

Code:
[SEL * FROM 
( SEL ORD_ID,NUM ,DATE 
from TABLE1 ) A
ON ORD_ID is NOT NULL
LEFT JOIN 
(
SELECT ORD_ID,NUM,DATE ,Contract_ID
FROM TABLE2) B
ON ORD_ID is NOT NULL
LEFT JOIN 
( SELECT ORD_ID,NUM,DATE ,Contract_ID
FROM TABLE3 ) C
ON (A.ORD_ID=C.ORD_ID
AND A.NUM=C.NUM)
OR ( C.Contract_ID=B.Contract_ID)
]


Last edited by Scrutinizer; 12-09-2015 at 02:25 PM.. Reason: code tags
 

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SARY(1) 							       Sary								   SARY(1)

NAME
sary - manual page for sary 1.0.2 SYNOPSIS
sary [OPTION]... PATTERN FILE DESCRIPTION
-c, --count only print a count of occurrences -i, --ignore-case ignore case distinctions -l, --lexicographical sort in lexicographical order -A, --after-context=NUM print NUM lines of trailing context -B, --before-context=NUM print NUM lines of leading context -C, --context=[NUM], print NUM (default 2) lines of output context -s, --start=TAG, print tagged region. set start tag to TAG -e, --end=TAG, print tagged region. set end tag to TAG -h, --help display this help and exit COPYRIGHT
Copyright (C) 2000 Satoru Takabayashi All rights reserved. This is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MER- CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. sary 1.0.2 December 2000 SARY(1)
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