Plateforme Level Extreme
Abonnement
Profil corporatif
Produits & Services
Support
Légal
English
Rushmore only apply with keyword INNER JOIN?
Message
De
20/06/2006 23:55:17
Hilmar Zonneveld
Independent Consultant
Cochabamba, Bolivie
 
 
À
20/06/2006 23:32:03
Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Divers
Thread ID:
01130407
Message ID:
01130414
Vues:
13
>>Instead of using INNER JOIN to link-up 2 or more tables, I would like to know that if I use another method for example :-
>>
>> SELECT a.*, b.Field1 FROM table1 a, table2 b WHERE a.KEY=b.KEY
>>
>>Will rushmore be applied with this SQL syntax?
>
>As long as the tags are present, it should be. As for me, I have a preference to always have only one table name assigned to the FROM clause. All the rest falls in the INNER JOIN syntax.

Me too, but I would add that this is not just a matter of personal preference, there is a clear advantage of doing so: If you use JOIN instead of WHERE to join the tables, it is easy to change your design and change from an inner join to an outer join, or vice-versa - just add or delete the LEFT keyword.

Also, unlike using only a WHERE clause, with JOIN it is clearer which parts of the command are used to join the tables, and which parts specify additional filtering conditions (whatever remains in the WHERE clause).
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)
Précédent
Suivant
Répondre
Fil
Voir

Click here to load this message in the networking platform