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SQL Select JOIN or WHERE clause
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20/03/2006 22:15:16
 
 
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Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Titre:
SQL Select JOIN or WHERE clause
Versions des environnements
Visual FoxPro:
VFP 9 SP1
OS:
Windows XP SP2
Network:
Windows 2003 Server
Database:
MS SQL Server
Divers
Thread ID:
01106086
Message ID:
01106086
Vues:
61
Hi all,

Can someone advise me the performance of SQL Select 1) vs 2):
1) SELECT abc.*,xyz.dfrom,xyz.dto FROM abc LEFT JOIN xyz ;
      ON abc.fld1=xyz.fld1 WHERE dfrom>=20060101 AND dto<=20060131

2) SELECT abc.*,xyz.dfrom,xyz.dto FROM abc LEFT JOIN xyz ;
     ON abc.fld1=xyz.fld1 AND dfrom>=20060101 AND dto<=20060131
Will (1) perform faster than (2)?

If yes, another question is how I can alter the SQL Select in the DBC if the DBC I am having has the (2) expression and I want to write a program to check for all occurences of (2) SQL Select.

Thanks in advance.
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