Re: Count the children - Mailing list pgsql-novice

From Sean Davis
Subject Re: Count the children
Date
Msg-id 264855a00908180807y25fdc55fja9f7854972591084@mail.gmail.com
Whole thread Raw
In response to Re: Count the children  (Sean Davis <sdavis2@mail.nih.gov>)
List pgsql-novice


On Tue, Aug 18, 2009 at 10:50 AM, Sean Davis <sdavis2@mail.nih.gov> wrote:


On Tue, Aug 18, 2009 at 10:34 AM, Michael Rowan <mike.rowan@internode.on.net> wrote:
I need what sounds like a very simple query - but I'm darned if I can figure it out.

I have two tables, parent and child related by child.parent_id = parent.id
The query should return, for each parent row, parent.name and number of child rows

Hi, Michael.

select parent.name,count(*) from parent join child on child.parent_id=parent.id;

I missed a "group by parent.name" above.
 

Sean



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