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LEFT JOIN IN SQL for FPD 2.6
Message
 
À
19/02/2000 04:20:04
Information générale
Forum:
Visual FoxPro
Catégorie:
FoxPro 2.x
Divers
Thread ID:
00334439
Message ID:
00334450
Vues:
41
Hi Zlatko.

Try this:
* set up some test data
create cursor First_Table (PK N(4,0), DataValue C(10))
insert into First_Table values (1, "One")
insert into First_Table values (2, "Two")
insert into First_Table values (3, "Three")
insert into First_Table values (4, "Four")
insert into First_Table values (5, "Five")

create cursor second_Table (PK N(4,0), FK N(4,0), DataValue C(10))
insert into Second_Table Values (1, 1, "First")
insert into Second_Table Values (2, 2, "Second")
insert into Second_Table Values (3, 3, "Third")

* Select all the records from the first table and any matching from the second

select F.*, s.* ;
	from First_Table F, Second_Table s ;
	where f.pk = s.fk ;
UNION ;
select f.*, 0000, 0000, space(10) ;
	from First_Table F ;
	where f.pk not in (select s.fk from Second_Table s) ;
INTO CURSOR LJoin

brow
The key is the UNION - get all of the records that do match from the first table, and UNION that set with all of the records that don't match.

HTH

Cheers,

Andrew

>FP 2.6, DOS. I've got two tables and connect them with a SQL statement using »WHEN first.key = second.key«. It works fine until in the second table doesn't exist a related record. In that case the record
>from the first table is ommited in the result of a SQL. Is it possible to make a statement as in VFP with »LEFT JOIN« option in FP 2.6? I know I could make a solution programming a DO... loop, but I prefer using a simple and faster SQL statement.
>
>Thanks, Zlatko.


If we were to introduce Visual FoxBase+, would we be able to work from the dotNet Prompt?


From Top 22 Developer Responses to defects in Software
2. "It’s not a bug, it’s a feature."
1. "I thought I fixed that."


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Unless specifically identified otherwise, anthing posted here is purely my opinion and may or may not reflect the policies or practices of Microsoft.
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