MySQL SUM Statemene

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Views: 1025 | Replies: 3

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Join Date: Jan 2006

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Asiima

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MySQL SUM Statemene

Apr 19th, 2008

Hi there,

Anyone to help me on sql code for SUM.
I need a query that gets the SUM of one table column and subtract it from the sum from another table column:
I tried this but it gave me wrong answer;

SELECT SUM(i.amount-p.amount) FROM income i, payments p;

Last edited by peter_budo : Apr 20th, 2008 at 6:36 am. Reason: Keep It Organized - please use [code] tags

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Join Date: Dec 2007

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mwasif

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Re: MySQL SUM Statemene

Apr 19th, 2008

Try

 Help with Code Tags 
 mysql Syntax (Toggle Plain Text) 
SELECT SUM(i.amount) - SUM(p.amount) FROM income i, payments p
SELECT SUM(i.amount) - SUM(p.amount) FROM income i, payments p

Last edited by mwasif : Apr 19th, 2008 at 3:15 pm.

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Join Date: Jan 2006

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Asiima

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Re: MySQL SUM Statemene

Apr 19th, 2008

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Originally Posted by mwasif

Try
Help with Code Tags

mysql Syntax (Toggle Plain Text)
SELECT SUM(i.amount) - SUM(p.amount) FROM income i, payments p
SELECT SUM(i.amount) - SUM(p.amount) FROM income i, payments p

Thanx but still doesn't work out

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Join Date: Apr 2008

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tesuji

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Re: MySQL SUM Statement

Apr 19th, 2008

hi,
without where clause cross product of both tables will be computed, that is each row of income will be combined with each row of payments. To prevent this, you need a where clause like where i.fieldofincome = p.fieldofpayments, If you don't have such common fields you can't join both tables.

krs,
cliff