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Select-SQL from 2 tables
Message
De
17/10/1997 19:21:56
 
 
À
17/10/1997 10:15:10
Information générale
Forum:
Visual FoxPro
Catégorie:
Codage, syntaxe et commandes
Divers
Thread ID:
00055144
Message ID:
00055249
Vues:
30
>>>>I need to Select information from 2 tables and put the results into one cursor. I think I need to do some kind of subquery but I can't quite come up with the syntax to make it work. Here is what I need:
>>>>
>>>>I have one table which contains, agreeno(agreement number),dist(district number), begdate(beginning date) and enddate. I need the agreeno and dist where begdate<=date()<=enddate.
>>>>SELECT DISTINCT agreeno,dist FROM agreemnt WHERE begdate<=date() AND enddate>=date()
>>>>
>>>>Then I need all fields from header.dbf for each dist selected above.
>>>>
>>>>Any suggestions?
>>>>
>>>>Shane
>>>
>>>Suggestions? Just join header.dbf table to the same Select command (I guess you should have some fields linking two tables together).
>>
>>This is what I came up with, let me know please if there is problem that I am overlooking.
>>
>>SELECT * FROM header WHERE alltrim(dist) IN (SELECT alltrim(dist) FROM agreemnt WHERE begdate <=date() AND enddate>=date())
>>
>>I had to put the alltrim on dist because without it FoxPro thinks it's short for DISTINCT.
>
>Yes, it should work, but not so fast as normal joint:
>Select Header.* ;
>From Header, Agreemnt ;
>Where Header.dist=Agreemnt.dist ;
>And Agreemnt.begdate <=date() ;
>And Agreemnt.enddate>=date()

You don't respect the DISTINCT condition in this SELECT.

Vlad
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