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Simple Interview Question


Simple Interview Question

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sarwaanmca
sarwaanmca
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select 5 & 17

What is the Output?
Ans is :1
1)how it will return 1 ?

2)what is the use of this query?

any one explain it pls..

Thank & Regards
Saravanan.D
Lowell
Lowell
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its a binary AND operation.

5 = 00000101
17 = 00010001



the only column in BOTH values binary representation above is the first column, representing 2^0, so the value is 1.



16 = 00010000
17 = 00010001



when AND-ing 16, and 16, the only shared column si the 2^4 column, which is 16.

Lowell

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Voide
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Lowell (7/24/2013)
its a binary AND operation.

5 = 00000101
17 = 00010001



the only column in BOTH values binary representation above is the first column, representing 2^0, so the value is 1.



16 = 00010000
17 = 00010001



when AND-ing 16, and 16, the only shared column si the 2^4 column, which is 16.


I just had PTSD flashbacks to assembly.
Sean Lange
Sean Lange
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I would have to say that is an absolutely horrid interview question. It is not testing your skills with sql server. I have seen the binary AND around the forums but I have never come across it in the real world (at least not in sql server).

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Eugene Elutin
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Sean Lange (7/24/2013)
I would have to say that is an absolutely horrid interview question. It is not testing your skills with sql server. I have seen the binary AND around the forums but I have never come across it in the real world (at least not in sql server).


It's called "Bitwise AND" :
http://msdn.microsoft.com/en-us/library/ms174965.aspx

I have used it few times...
I'll try to find one thread on this forum where I've used it to help to achieve quite interesting requirements.

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"The only true wisdom is in knowing you know nothing"
"O skol'ko nam otkrytiy chudnyh prevnosit microsofta duh!":-D
(So many miracle inventions provided by MS to us...)

How to post your question to get the best and quick help
Sean Lange
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Eugene Elutin (7/24/2013)
Sean Lange (7/24/2013)
I would have to say that is an absolutely horrid interview question. It is not testing your skills with sql server. I have seen the binary AND around the forums but I have never come across it in the real world (at least not in sql server).


It's called "Bitwise AND" :
http://msdn.microsoft.com/en-us/library/ms174965.aspx

I have used it few times...
I'll try to find one thread on this forum where I've used it to help to achieve quite interesting requirements.


I knew it wasn't binary AND but couldn't think of the proper name for the life of me. :-P

If you can find that thread it would be interesting.

I still say it is a poor interview question because it so rarely used.

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Mark Cowne
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You can use '&' for decoding @@OPTIONS

PRINT @@OPTIONS
IF ( (8 & @@OPTIONS) = 8 ) PRINT 'ANSI_WARNINGS'
IF ( (16 & @@OPTIONS) = 16 ) PRINT 'ANSI_PADDING'
IF ( (32 & @@OPTIONS) = 32 ) PRINT 'ANSI_NULLS'
IF ( (64 & @@OPTIONS) = 64 ) PRINT 'ARITHABORT'
IF ( (256 & @@OPTIONS) = 256 ) PRINT 'QUOTED_IDENTIFIER'
IF ( (512 & @@OPTIONS) = 512 ) PRINT 'NOCOUNT'



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How to get the best help on a forum

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Mark Cowne
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Here's a query using '&'

http://www.sqlservercentral.com/Forums/FindPost1422007.aspx

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Deja View - The strange feeling that somewhere, sometime you've optimised this query before

How to get the best help on a forum

http://www.sqlservercentral.com/articles/Best+Practices/61537




Sean Lange
Sean Lange
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Mark-101232 (7/24/2013)
Here's a query using '&'

http://www.sqlservercentral.com/Forums/FindPost1422007.aspx


I remember that thread. And I would say that yes it can be done but the end result is a static set of values. I would say that doing this in sql is rather pointless.

Your example of parsing OPTIONS though is pretty cool.

_______________________________________________________________

Need help? Help us help you.

Read the article at http://www.sqlservercentral.com/articles/Best+Practices/61537/ for best practices on asking questions.

Need to split a string? Try Jeff Moden's splitter.

Cross Tabs and Pivots, Part 1 – Converting Rows to Columns
Cross Tabs and Pivots, Part 2 - Dynamic Cross Tabs
Understanding and Using APPLY (Part 1)
Understanding and Using APPLY (Part 2)
Koen Verbeeck
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sarwaanmca (7/24/2013)
select 5 & 17

What is the Output?
Ans is :1
1)how it will return 1 ?

2)what is the use of this query?

any one explain it pls..

Thank & Regards
Saravanan.D


My answer to a question like this (if I wouldn't know the answer):
"Can you show me a useful query for this?"

Probably will knock their socks off :-D



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