RE: Basic SQL Help

[CWilt@xxxxxxxxxxxx]

Nope, a union joins two subselect.

Basically you have two separate select statements that return results.  The
union combines the two result sets into 1 result set.

select flda, fldb, fldc
from file1

union 

select flda, fldb, fldc
from file2



if file1 has:
f1a1, f1b1, f1c1
f1a2, f1b2, f1c2
f1a3, f1b3, f1c3

and file2 has
f2a1, f2b1, f2c1
f2a2, f2b2, f2c2
f2a3, f2b3, f2c3

the results of the UNION is:
f1a1, f1b1, f1c1
f1a2, f1b2, f1c2
f1a3, f1b3, f1c3
f2a1, f2b1, f2c1
f2a2, f2b2, f2c2
f2a3, f2b3, f2c3


Note that the two subselects must have the same numbers and types of
columns.  Which means you may have to add some dummy fields or change
numeric fields to char.

HTH,
Charles


> -----Original Message-----
> From: michaelr_41@xxxxxxxxxxxxxx [mailto:michaelr_41@xxxxxxxxxxxxxx]
> Sent: Thursday, June 24, 2004 2:36 PM
> To: Midrange Systems Technical Discussion
> Subject: Re: Basic SQL Help
> 
> 
> Thanks Carel...I'll give it a try...and I'll also study up on 
> UNION. Is
> that like a subselect?
> 
> On Thu, 24 Jun 2004 20:23:53 +0200, "Carel Teijgeler"
> <coteijgeler@xxxxxxxxx> said:
> > Michael,
> > 
> > A rudimentary shot without testing:
> > 
> > SELECT 'A' AS Code, a.parent, b.id, c.child, d.id
> > FROM fileA a, fileB b, fileA c, fileB d
> > WHERE (a.parent = b.sku AND b.id = 1
> > AND  c.child = d.sku and d.id = 5
> > AND  a.parent = c.parent)
> > UNION
> > SELECT 'B' AS Code a.parent, b.id, c.child, d.id
> > FROM fileA a, fileB b, fileA c, fileB d
> > WHERE (a.parent = b.sku AND b.id = 1
> > AND  c.child = d.sku and d.id = 9
> > AND  a.parent = c.parent)
> > ORDER BY Code, a.parent
> > 
> > To get the description in you have to put in fileC twice, 
> each with a
> > different alias.
> > 
> > In QMQRY you can create a FORM to omit the column Code and 
> break on the
> > column a.parent.
> > 
> > Regards,
> > Carel Teijgeler
> > 
> > 
> > 
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