Re: How to create such query ?

[Terrence Enger <tenger@xxxxxxxxxxxxxxxx>]

On Wed, 2008-09-24 at 16:02 +0200, Tomasz Skorża wrote:
> Hi
>
> I have three files:
> File1 - with all user profiles (outfile from DSPUSRPRF)
> File2 - with the same user profile (but not every profile from File1 has record in File2), this 
> file2 has also additional field - "code of divison" i.e. AC
> File3 - where code are explain i.e. AC - Accounting (all codes from File2 has explanation in File3)
>
> And now I would like to get report where I receive ALL profile from File1 with name of Division (if 
> profile doesn't exist in File2 should have BLANK as division)

To get rows from File1 even in the absence of a row in File2, you want
what is called a "left join" ...

    File1 left join2 File2 on File1.AC = File2.AC

To ensure that AC is blank in the absence of a row in File2, select ...

    coalesce( File2.AC, ' ' ) AC

> But I received only this which exist in File2 or nothing. How to connect these three files? 

If File3 lacks an explanation for AC = blank, then the join from File3
must again be a *left* join.

HTH,
Terry.

> Which 
> subquery will be correct?
>
> -- 
> Pozdrawiam
>
> ---------------------------------------------------------
> Tomek