Click here to Skip to main content
11,706,979 members (30,469 online)
Click here to Skip to main content

Tagged as

Bitwise OR aggregate

, 28 Mar 2012 CPOL 7.6K 1
Rate this:
Please Sign up or sign in to vote.
Performing a bitwise OR aggregate in SQL Server

In a few of the tables I'm working with, I have some bit-mapped values. In other words, there is a numeric (integer) column and the values are all powers of two (1, 2, 4, 8, etc.) and each power of two has a different meaning. When I want to summarize this data, I want to perform a bitwise OR on the values for a particular entity, for example if a particular entity has records with values of 1, 2, and 8, then I want to show the value 11. SQL Server has a bitwise OR operator (|), but it doesn't have a bitwise OR aggregate function. In the simple example above, you may notice that 1 | 2 | 8 == 1 + 2 + 8 so it would be good if we could use the SUM aggregate function SUM ( sourcecolumn ), but that won't work if any of the values are duplicated: 1 | 1 | 2 | 8 != 1 + 1 + 2 + 8 . Fortunately, you can use the SUM function to add up only the DISTINCT values: SUM ( DISTINCT sourcecolumn ). This, then, can be used as a bitwise OR aggregate function, provided the values in the column are powers of two.


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Software Developer (Senior)
United States United States
BSCS 1992 Wentworth Institute of Technology

Originally from the Boston (MA) area. Lived in SoCal for a while. Now in the Phoenix (AZ) area.

OpenVMS enthusiast, ISO 8601 evangelist, photographer, opinionated SOB, acknowledged contrarian


"If you need help knowing what to think, let me know and I'll tell you." -- Jeffrey Snover [MSFT]

"Typing is no substitute for thinking." -- R.W. Hamming

"I find it appalling that you can become a programmer with less training than it takes to become a plumber." -- Bjarne Stroustrup

ZagNut’s Law: Arrogance is inversely proportional to ability.

"Well blow me sideways with a plastic marionette. I've just learned something new - and if I could award you a 100 for that post I would. Way to go you keyboard lovegod you." -- Pete O'Hanlon

"linq'ish" sounds like "inept" in German -- Andreas Gieriet

"Things would be different if I ran the zoo." -- Dr. Seuss

"Wrong is evil, and it must be defeated." – Jeff Ello

"A good designer must rely on experience, on precise, logical thinking, and on pedantic exactness." -- Nigel Shaw

“It’s always easier to do it the hard way.” -- Blackhart

“If Unix wasn’t so bad that you can’t give it away, Bill Gates would never have succeeded in selling Windows.” -- Blackhart

"Omit needless local variables." -- Strunk... had he taught programming

"We learn more from our mistakes than we do from getting it right the first time."

My first rule of debugging: "If you get a different error message, you're making progress."

My golden rule of database management: "Do not unto others' databases as you would not have done unto yours."

My general rule of software development: "Design should be top-down, but implementation should be bottom-up."

You may also be interested in...

Comments and Discussions

QuestionThis is not right for all cases Pin
tsr851-Apr-12 0:00
membertsr851-Apr-12 0:00 
AnswerRe: This is not right for all cases Pin
PIEBALDconsult1-Apr-12 17:00
memberPIEBALDconsult1-Apr-12 17:00 
AnswerRe: This is not right for all cases Pin
Igor Voynovskyy4-Apr-15 0:43
memberIgor Voynovskyy4-Apr-15 0:43 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.

| Advertise | Privacy | Terms of Use | Mobile
Web04 | 2.8.150819.1 | Last Updated 28 Mar 2012
Article Copyright 2012 by PIEBALDconsult
Everything else Copyright © CodeProject, 1999-2015
Layout: fixed | fluid