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status2 value 'not in the book'

Posted on 2010-08-17
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Last Modified: 2012-05-10
my database shows a status2 value of 1090519040. But in http://msdn.microsoft.com/en-us/library/aa260406%28SQL.80%29.aspx i do not see such a value- how do you interpret it then?

thanks
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Question by:anushahanna
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chapmandew earned 400 total points
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by:anushahanna
ID: 33457828
still do not see 1090519040 in that page? would you expect me to see it?
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by:chapmandew
ID: 33458365
Case status2 & 1090519040 when 1090519040 then 1 else 0 end.
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by:Scott Pletcher
Scott Pletcher earned 1600 total points
ID: 33459973
>> still do not see 1090519040 in that page? would you expect me to see it? <<

No.  That is the combination of two different bit values being set:

1073741824
16777216

Unfortunately, BOL doesn't document the meanings of those two particular bits.
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by:anushahanna
ID: 33464485
>>That is the combination of two different bit values being set

can you pl explain how that works..
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by:Scott Pletcher
Scott Pletcher earned 1600 total points
ID: 33470149
In SQL an integer is signed, and is 4 bytes, thus 31 bits.

Each bit can be on or off, of course, and has its own unique value.  Off is always 0.  On is by power of two, like so:
Bit0 = 1; Bit1 = 2; Bit3 = 4; Bit4 = 8; etc.

So, say bits 1 and 4 were on ... the field would contain 10 ( 2 + 8 ) .

Note that no bits ever overlap, even when added up.  That is, the sum of all preceding bits is always one less than the current bit.  (For example, Bit5 = 16; the sum of all earlier bits being on is 15).

Thus, you can always tell which individual bits are on and which are on in a given total value for the integer.
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by:anushahanna
ID: 33477387
very helpful explanation. thanks scott.

in this reference, can you show how does 1073741824 & 16777216 result in 1090519040
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by:Scott Pletcher
Scott Pletcher earned 1600 total points
ID: 33487937
Add them:

1073741824 + 16777216 = 1090519040

That means no other bits are on, or the value would be higher.  Each bit on increases the value of the integer column.

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by:anushahanna
ID: 33502010
OK. Many thanks Scott.

But, on the first hand, how did you quickly discern the 2 numbers.
16777216 is also not in that reference.

do you know these numbers just by experience?

and 1073741824 is in status column. So that means these values float between status and status2?
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by:Scott Pletcher
Scott Pletcher earned 1600 total points
ID: 33502481
>> do you know these numbers just by experience? <<

Nah.  I just kept using power of 2 values, then did a quick test to see if they were present :-) .


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by:anushahanna
ID: 33507128
that makes a brilliant expert! Thanks Scott! You always have an extra insight into things - simple yet quiet impact-ful.
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