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From:Gavin Towey Date:December 15 2009 7:14pm
Subject:RE: Count records in join
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Hi Miguel,

You'll need to use LEFT JOIN, that will show all records that match and a row in the
second table will all values NULL where there is no match.  Then you find all those rows
that have no match in your WHERE clause.

Regards,
Gavin Towey

-----Original Message-----
From: Miguel Vaz [mailto:pagongski@stripped]
Sent: Tuesday, December 15, 2009 10:43 AM
To: mysql@stripped
Subject: Count records in join

Hi,

I am stuck with a suposedly simple query:

- i have two tables (:

PROGS
id_prog
name

EVENTS
id
id_prog
name

How can i list all records from PROGS with a sum of how many events each
have? I want to find the progs that are empty.

I remember something about using NULL, but i cant remember. :-P

Thanks.

MV

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Thread
Count records in joinMiguel Vaz15 Dec
  • RE: Count records in joinGavin Towey15 Dec
    • Re: Count records in joinJohan De Meersman16 Dec
      • Re: Count records in joinMiguel Vaz16 Dec
        • RE: Count records in joinJerry Schwartz16 Dec
          • Re: Count records in joinMiguel Vaz16 Dec