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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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SQLOBJECT-ADMIN(1)					      General Commands Manual						SQLOBJECT-ADMIN(1)

NAME
sqlobject-admin - manage your database as defined with SQLObject classes SYNOPSIS
sqlobject-admin [options] command DESCRIPTION
The sqlobject-admin tool included with SQLObject allows you to manage your database as defined with SQLObject classes. Some of the features include creating tables, checking the status of the database, recording a version of a schema, and updating the database to match the version of the schema in your code. COMMANDS
The following commands are recognized: help Show the help text. create Find the tables and create them. Existing tables are simply skipped. sql Show the SQL to create all the tables. drop Drop tables. Missing tables are skipped. execute Execute an arbitrary SQL expression. list List out all the found classes. status Show if tables are present in the database. record Record historical information about the database status upgrade Update the database to a new version (as created by record) OPTIONS
-c CONNECTION, --connection=CONNECTION Connection string for the database . -f FILENAME, --config-file=FILENAME Configuration file from which to get the connection to the database. -m MODULE, --module=MODULE A module to look in for classes. -p PACKAGE, --package=PACKAGE A package to look in. --class=CLASSMATCH Restricting the found classes to the matching classes. --egg=EGG_SPEC Egg description that should be loaded. AUTHORS
This manual page was written by Carl Chenet <chaica@ohmytux.com>. LICENSE
This package is licensed under the GNU Lesser General Public License. You can find the full text of the LGPL in /usr/share/common-licenses/LGPL in your Debian system. 06/03/2010 SQLOBJECT-ADMIN(1)
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