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11/29/2005 at 02:35PM PST, ID: 21647154
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8.4

Need to SUM the sizes of DISTINCT files, so we don't count the sizes more than once

Asked by BigDavy in MS SQL Server

Hi, I need help with the SUM command.  I have a table called "today" that lists ads worked on today; some ads were worked on more than once.  I have another table called "sizes" with the sizes of all the ads in my database (not just today).   I want to subtotal the count and size of the ads that were worked on today, but I only want to count each ad once when adding up the sizes.

Table "today":
User   Ad
Joe    ABC
Mary  DEF
Mike   ABC
Joe     GHI

Table "sizes":
Ad      Inches
ABC    2
DEF    3
GHI     2
JKL      4

Desired result (2+3+2=7 inches):
Adcount   Inches
3             7

The following doesn't work right:

select count(distinct today.ad) as Adcount,sum(sizes.inches) as Inches from today,sizes where today.ad=sizes.ad

which produces the following result (2+3+2+2=9):
Adcount   Inches
3             9
which is wrong because the size of ad ABC was counted twice.

The following is also bad:

select count(distinct today.ad) as Adcount,sum(distinct sizes.inches) as Inches from today,sizes where today.ad=sizes.ad

which produces the following result (2+3=5):
Adcount   Inches
3             5
which is wrong because the three 2-inch ads are only counted as one 2-inch ad.

I'm a newbie, looking for a simple approach if there is one! Thanks!
[+][-]11/29/05 02:45 PM, ID: 15384064

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[+][-]11/29/05 02:51 PM, ID: 15384105

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[+][-]11/29/05 07:16 PM, ID: 15385206

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Zone: MS SQL Server
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Solution Provided By: acperkins
Participating Experts: 3
Solution Grade: A
 
 
[+][-]11/30/05 01:00 AM, ID: 15386543

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[+][-]11/30/05 01:02 AM, ID: 15386551

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[+][-]11/30/05 02:19 PM, ID: 15392237

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