Conditionally Suming Rows

MS SQL Development

Dev Shed Forums Sponsor:

Dell PowerEdge Servers

February 18th, 2004, 09:27 AM

imbrokn

Contributing User

Join Date: Sep 2001

Location: NJ

Posts: 428

Time spent in forums: 11 h 34 m 8 sec
Reputation Power: 10

Conditionally Suming Rows

What I have is two columns that I want to sum. I'll call these columns A and column B. I want to Sum the values of Column A but only if the Column B is 0 or Null. Lets say I have:

Code:

   ColumnA          Column B
   -----------------------------
   100                 300
   100                 0
   100                 0

Results: Sum(ColumnA) = 200, Sum(ColumnB) = 300

Is it possible to do this with a query? Or do i need to use a Stored Procedure. The query itself is actually much more complicated than what I have shown, but I am just trying to get the concept. I know that I could simply erase the ColumnA value when a ColumnB value is entered, but the number at ColumnA is still valuable information. It doesn't seem to make sense to me that I would have to delete it. I also thought about do another query that just selected rows where columb B has a value, and subtracting that sum from the total sum of all rows, while this would work I can't seem to figure out how I would even implement that.

February 18th, 2004, 11:32 AM

saodl

Registered User

Join Date: Feb 2004

Location: Los Angeles, CA

Posts: 21

Time spent in forums: < 1 sec
Reputation Power: 0

Easy:

Code:

SELECT SUM(
      CASE
        WHERE [Column B] = 0 OR [Column B] IS NULL THEN 0 
        ELSE [Column A]
      END) AS sum_Column_A
    ,SUM([Column B]) AS sum_Column_B
FROM YourTable

if you want just Column A (you can still use the above query, or...)

Code:

SELECT SUM([Column A]) AS sum_Column_A
FROM YourTable
WHERE [Column B] != 0 AND [Column B] IS NOT NULL

February 18th, 2004, 03:52 PM

imbrokn

Contributing User

Join Date: Sep 2001

Location: NJ

Posts: 428

Time spent in forums: 11 h 34 m 8 sec
Reputation Power: 10

Thanks. Works like a charm.

Viewing: Dev Shed Forums > Databases > MS SQL Development > Conditionally Suming Rows

« Previous Thread | Next Thread »

Thread Tools	Search this Thread
Email this Page	Search this Thread: Advanced Search
Display Modes	Rate This Thread
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode	Rate This Thread:

Posting Rules
You may not post new threads You may not post replies You may not post attachments You may not edit your posts vB code is On Smilies are On [IMG] code is On HTML code is Off

View Your Warnings | New Posts | Latest News | Latest Threads | Shoutbox

Forum Jump

Free IT White Papers!

Accelerating Trading Partner Performance
One in five. That's how many partner transactions have at least one error. That is an amazing statistic, particularly given the extraordinary leaps in innovation across the global supply chain during the past two decades. Download this white paper to learn more.

Competing on Analytics
This Tech Analysis is designed to help identify characteristics shared by analytics competitors, and includes information about 32 organizations that have made a commitment to quantitative, fact-based analysis.

Cost Effective Scaling with Virtualization and Coyote Point Systems
An overview of the industry trend toward virtualization, how server consolidation has increased the importance of application uptime and the steps being taken to integrate load balancing technology with virtualized servers.

Five Checkpoints to Implementing IP Telephony
Implementation planning for IP PBX software and IP telephony has become vital as businesses replace discontinued legacy PBX phone systems. This informative whitepaper outlines five "checkpoints" for any implementation plan that will help make IP communications a successful proposition.

Hosted Email Security: Staying Ahead of New Threats
In the last two years, email has become a fierce battleground between the nefarious forces of spam and malware, and the heroes of messaging protection. The spam volumes increased alarmingly every month, bringing clever new forms of phishing and virus propagation attacks.

More Free IT White Papers!