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Aggregate bit operator in TSQL


Aggregate bit operator in TSQL

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vishnu_modi
vishnu_modi
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Hello All:

Do we have any aggregate bit operator in TSql?

Consider the following scenario
I have a table as follows
Col1 Col2 Col3
1 1 0
0 0 1
1 0 0

Now I want to perform a select on the above table such that I get a single row where each column is a OR of that column for all rows

For e.g
SELECT func(Col1), func(Col2), func(Col3)

Output
1, 1, 1

Thanks,
Vishnu
RBarryYoung
RBarryYoung
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There is no such function. However, you can emulate this with the following:

Select
Case When Sum(Cast(Col1 as int)) > 1 Then 1 Else 0 End



-- RBarryYoung, (302)375-0451 blog: MovingSQL.com, Twitter: @RBarryYoung
Proactive Performance Solutions, Inc.
"Performance is our middle name."
Jeff Moden
Jeff Moden
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Here's a real cheater method...

 SELECT SIGN(SUM(Col1+0)), SIGN(SUM(Col2+0)), SIGN(SUM(Col3+0))
FROM SomeTable



--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
     Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is usually not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

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RBarryYoung
RBarryYoung
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Yeah, I always forget that T-SQL has the SIGN() function.

-- RBarryYoung, (302)375-0451 blog: MovingSQL.com, Twitter: @RBarryYoung
Proactive Performance Solutions, Inc.
"Performance is our middle name."
Jeff Moden
Jeff Moden
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Heh... and it works so well for these types of bitwise ops.

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
     Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is usually not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

Helpful Links:
How to post code problems
How to post performance problems
Forum FAQs
RBarryYoung
RBarryYoung
SSCrazy Eights
SSCrazy Eights (9.4K reputation)SSCrazy Eights (9.4K reputation)SSCrazy Eights (9.4K reputation)SSCrazy Eights (9.4K reputation)SSCrazy Eights (9.4K reputation)SSCrazy Eights (9.4K reputation)SSCrazy Eights (9.4K reputation)SSCrazy Eights (9.4K reputation)

Group: General Forum Members
Points: 9436 Visits: 9517
Well it's shorter than CASE, but not much beyond that.

-- RBarryYoung, (302)375-0451 blog: MovingSQL.com, Twitter: @RBarryYoung
Proactive Performance Solutions, Inc.
"Performance is our middle name."
Jeff Moden
Jeff Moden
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Points: 44968 Visits: 39863
I agree... CASE is almost as fast and bit easier to read.

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
     Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is usually not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

Helpful Links:
How to post code problems
How to post performance problems
Forum FAQs
RBarryYoung
RBarryYoung
SSCrazy Eights
SSCrazy Eights (9.4K reputation)SSCrazy Eights (9.4K reputation)SSCrazy Eights (9.4K reputation)SSCrazy Eights (9.4K reputation)SSCrazy Eights (9.4K reputation)SSCrazy Eights (9.4K reputation)SSCrazy Eights (9.4K reputation)SSCrazy Eights (9.4K reputation)

Group: General Forum Members
Points: 9436 Visits: 9517
And it's so much more general. The reason that I keep forgetting that SIGN() is in SQL is not because I am not familiar with it. Heck, I used it often as SGN() back in the 70's in both FORTRAN and BASIC. Rather, I am sure that it's the very generality of the CASE function that leads me to subliminally lump SIGN() inot the category of "things that I don't have to remember".

-- RBarryYoung, (302)375-0451 blog: MovingSQL.com, Twitter: @RBarryYoung
Proactive Performance Solutions, Inc.
"Performance is our middle name."
Mauve
Mauve
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Group: General Forum Members
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Jeff Moden (12/22/2008)
Here's a real cheater method...

 SELECT SIGN(SUM(Col1+0)), SIGN(SUM(Col2+0)), SIGN(SUM(Col3+0))
FROM SomeTable



That only works for the first bit. I have a similar problem where we use the first 5 bits as "permissions" on objects and I need to OR the values from multiple rows. Unfortunately, I'm performing RBAR, albeit without a cursor (using SQL Server's multiple row select into a scalar variable approach), in a UDF. E.g.,
SELECT @v_permissions = ISNULL(@v_permissions, 0) | x.permissions FROM ...



Any T-SQL tricks? E.g., the following values need to be OR'd together with the result being (decimal) 31.
Bit Mask Decimal Value
0000000001 1
0000000101 5
0000000111 7
0000010001 17
0000010011 19
0000011101 29



(PHB) I think we should build an SQL database. (Dilbert) What color do you want that database? (PHB) I think mauve has the most RAM.
RBarryYoung
RBarryYoung
SSCrazy Eights
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Group: General Forum Members
Points: 9436 Visits: 9517
JohnG; Actually, we've been talking about the BIT datatype. I think that you are talking about bit-masks encoded into INT's.

-- RBarryYoung, (302)375-0451 blog: MovingSQL.com, Twitter: @RBarryYoung
Proactive Performance Solutions, Inc.
"Performance is our middle name."
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