st: Re: Issues with merging data

["Michael Blasnik" <michael.blasnik@verizon.net>]

I think the -nokeep- option to merge does exactly what you want.  If you had 
read the help on merge you would have found this out for yourself.  Stata's 
merge command is not a SQL inner join.

Michael Blasnik
michael.blasnik@verizon.net

----- Original Message ----- 
"Anibal Santos" <ssrnmail@gmail.com> wrote
To: <statalist@hsphsun2.harvard.edu>
Sent: Monday, May 15, 2006 7:12 PM
Subject: st: Issues with merging data



> Hi everyone,
>
> I'm trying to merge two datasets: one with accounting data for several
> companies and the other with monthly stock returns and market value. I'm
> using the following command:
>
> . merge dscd Year Month using "C:\DATA\mktdata\ret_mv.dta", unique sort
> With the accounting data loaded in memory.
> After running this command I edited the merged file and found that stata
> used all the observations from ret_mv.dta, even though the accounting data
> file only has information for one Year and one Month per observation. Ex.:
<snip>

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