Re: I can not add up columns when using a left outer join. Any ideas as to why?

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От Richard Broersma Jr
Тема Re: I can not add up columns when using a left outer join. Any ideas as to why?
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Msg-id 121558.45416.qm@web31803.mail.mud.yahoo.com
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Ответ на I can not add up columns when using a left outer join. Any ideas as to why?  ("Robert Balzli Jr" <robert.balzli@xilinx.com>)
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> I want to add x and y. John and Joe do not have a "y" value, so the LEFT
> JOIN returns NULL. Likewise Jane does not have a value for "x" so the
> LEFT JOIN returns null for her. The "x" and "y" columns are correct, but
> I would expect the "total" column to have 24, 232, and 4.  myview is a
> view that converts id numbers to the actual names. run, project and name
> come from myview. Both x and y come from the site table.

> Can anyone tell me why the "total" column is empty?

becuase null + <pretty much anything> = null

check out COALESCE:
http://www.postgresql.org/docs/8.1/interactive/functions-conditional.html#AEN12654

Regards,

Richard Broersm Jr.

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