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T-SQL (SS2K8)
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convert data type
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convert data type
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sqlfriends
sqlfriends
Posted Tuesday, November 27, 2012 4:11 PM
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I would like to convert a column from varchar(10) to int.
I also want to ignore any values that have charaters in it.
I searched online and used this:
select RecordId, [name]
,Cast(BuildingCode as int) as BuildingCode
where BuildingCode Not LIKE '%[^0-9.-]%'
but I don't actually know what does this Not LIKE '%[^0-9.-]%' mean?
What ^ represent for?
Thanks
Post #1389455
Koen Verbeeck
Koen Verbeeck
Posted Wednesday, November 28, 2012 12:32 AM
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^ is the negation. So %[^0-9.-]% means "every character that is not 0 through 9, a dot or the minus symbol".
LIKE (Transact-SQL)
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Post #1389539
WolfgangE
WolfgangE
Posted Wednesday, November 28, 2012 1:12 AM
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Here is a nice article which shows you why one would use this expression:
http://www.sqlservercentral.com/articles/IsNumeric/71512/
Post #1389552
subbareddy542
subbareddy542
Posted Wednesday, November 28, 2012 2:39 AM
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pls check below code:
declare @t1 table(id int,name varchar(10))
insert into @t1(id,name) values(1,'1'),(2,'2'),(3,'4'),(4,'7'),(5,'8_'),(9,'9'),(10,'0')
select id,CONVERT(int,replace(name,'_','')) from @t1
--CONVERT(int,replace(name,'_','')) from @t1
where name like '%[^0_9]%'
here name will come between 0 and 9 (zero,nine related records will not come)
Post #1389592
sqlfriends
sqlfriends
Posted Wednesday, November 28, 2012 10:10 AM
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Koen Verbeeck (11/28/2012)
^ is the negation. So %[^0-9.-]% means "every character that is not 0 through 9, a dot or the minus symbol".
LIKE (Transact-SQL)
Thanks, and thanks for site link, it makes more sense to me now.
If this is the case, I think I don't need to include . and - sign.
Because my building code always is a number, no negative, no decimals.
So shall I just use
not like %[^0-9]%
Post #1389954
Koen Verbeeck
Koen Verbeeck
Posted Wednesday, November 28, 2012 10:25 AM
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sqlfriends (11/28/2012)
Koen Verbeeck (11/28/2012)
^ is the negation. So %[^0-9.-]% means "every character that is not 0 through 9, a dot or the minus symbol".
LIKE (Transact-SQL)
Thanks, and thanks for site link, it makes more sense to me now.
If this is the case, I think I don't need to include . and - sign.
Because my building code always is a number, no negative, no decimals.
So shall I just use
not like %[^0-9]%
This is actually a double negation, so the following should work as well:
LIKE '%[0-9]%'
Be aware that using the % symbol at the start of a LIKE clause won't have good performance, as an index can't be used.
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Post #1389972
sqlfriends
sqlfriends
Posted Wednesday, November 28, 2012 10:34 AM
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Thanks, that makes sense.
But I wonder why some people use : not like %[^0-9]%
For my case, can I just change it to
Like '[0-9]%'.
What is the difference between like '%[0-9]%'
and like '[0-9]%'.
Post #1389980
Koen Verbeeck
Koen Verbeeck
Posted Wednesday, November 28, 2012 10:38 AM
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There's no logical difference between NOT LIKE '%[^0-9]%' and LIKE '%[0-9]%'. Because the first one is a double negation, it will be the same when you leave all the negations out.
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Post #1389985
sqlfriends
sqlfriends
Posted Wednesday, November 28, 2012 10:40 AM
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Thanks,
how about the difference
between
like '%[0-9]%'
and like '[0-9]%'.
Post #1389988
Sean Lange
Sean Lange
Posted Wednesday, November 28, 2012 11:34 AM
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sqlfriends (11/28/2012)
Thanks,
how about the difference
between
like '%[0-9]%'
and like '[0-9]%'.
Are you familiar with with using wildcard searches? The first one will find any row that contains a 0-9 anywhere in the value. The second one will find any row that starts with 0-9.
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