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Back to basics


Back to basics

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Revenant
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Comments posted to this topic are about the item Back to basics
zymos
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Great question on data types. Thanks.
Danny Ocean
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Good question. But i never feel to use "Bitwise AND" (&) in real working scenario. It will good, if anyone come with some real working example. :-)

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Koen Verbeeck
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Nice question, thanks!


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Patibandla
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What if i define @S as BIGINT

Can you give me a real time scenario as in this operator would be useful. i am just a bit curious as i have never used used it.
martin.whitton
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Danny Ocean (7/1/2013)
Good question. But i never feel to use "Bitwise AND" (&) in real working scenario. It will good, if anyone come with some real working example. :-)

It provides a neat way of sending multiple options as a single integer parameter.

For example, let's say you have a table called "Locations" with 2 columns, LocationID and Location, containing the following values:

LocationID Location
1 London
2 Dublin
4 Paris
8 Berlin
16 New York
etc...

Then you could select any combination of Location values as follows:

declare @Selection int;
set @Selection=10; -- (this will select Dublin and Paris, because Dublin's LocationID plus Paris's LocationID equals 10)

select
Location
from
Locations
where
LocationId & @Selection>0;


Danny Ocean
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martin.whitton (7/2/2013)
Danny Ocean (7/1/2013)
Good question. But i never feel to use "Bitwise AND" (&) in real working scenario. It will good, if anyone come with some real working example. :-)

It provides a neat way of sending multiple options as a single integer parameter.

For example, let's say you have a table called "Locations" with 2 columns, LocationID and Location, containing the following values:

LocationID Location
1 London
2 Dublin
4 Paris
8 Berlin
16 New York
etc...

Then you could select any combination of Location values as follows:

declare @Selection int;
set @Selection=10; -- (this will select Dublin and Paris, because Dublin's LocationID plus Paris's LocationID equals 10)

select
Location
from
Locations
where
LocationId & @Selection>0;





Thanks martin :-)

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Lokesh Vij
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martin.whitton (7/2/2013)

It provides a neat way of sending multiple options as a single integer parameter.


Nice example Martin :-)

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sqldoubleg
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Danny Ocean (7/1/2013)
Good question. But i never feel to use "Bitwise AND" (&) in real working scenario. It will good, if anyone come with some real working example. :-)


Hi, another example where BIT comparison is useful, msdb..sysschedules keeps the freq_interval in bitwise value Smile


use [msdb]
go
create table #DaysOfWeekBitWise(
[bitValue] [tinyint] NOT NULL PRIMARY KEY,
[name] [varchar](10) NULL,
)
go
insert into #DaysOfWeekBitWise ([bitValue], [name])
values (1, N'Sunday')
, (2, N'Monday')
, (4, N'Tuesday')
, (8, N'Wednesday')
, (16, N'Thursday')
, (32, N'Friday')
, (64, N'Saturday')
go

select j.name
, case when j.enabled = 1 then 'Yes' else 'No' end as enabled
, jsch.next_run_date
, jsch.next_run_time
--, jst.*
, s.freq_interval
, ISNULL( STUFF( (SELECT N', ' + name FROM #DaysOfWeekBitWise AS B WHERE B.bitValue & s.freq_interval = B.bitValue FOR XML PATH('') ), 1, 2, '' ), 'None' ) AS backup_schedule
from msdb.dbo.sysjobs as j
left join msdb.dbo.sysjobschedules as jsch
on jsch.job_id = j.job_id
left join msdb.dbo.sysschedules as s
on s.schedule_id = jsch.schedule_id
order by j.name
go
drop table #DaysOfWeekBitWise
go



Cheers
Thomas Abraham
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Patibandla (7/2/2013)
What if i define @S as BIGINT

Can you give me a real time scenario as in this operator would be useful. i am just a bit curious as i have never used used it.


The last time I saw it used in a database was similar to the city option example given. In this instance, it was used to determine permissions across multiple databases by comparing the database 'lock' (say '01001001') to the user 'key' (say '11011001'). If the bitwise AND came back the same as the database lock, then you had access to the database.

I would note the field is semantically overloaded. But, that is a different discussion.

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