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SQL Server Query PatIndex Question

Posted on 2011-09-06
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Last Modified: 2012-05-12
Hello all,

I have a function as shown here that is stripping out any non alphanumeric characters except the plus (+) sign.  I run an update statement against the whole table currently where I say for example:

Update Customer Set CustomerNumber = dboKeepNonAlphaCharacters(CustomerNumber)

The problem is this table has millions of rows so the logs grow when doing this and performance is slowed.  How can I only update those records that have a non alphanumberic number like shown below to only update that subset of records to keep the log down?


Alter Function [dbo].[KeepNonAlphaCharacters](@Temp VarChar(35)) Returns VarChar(35)
 AS
 Begin
While PatIndex('%[^a-zA-Z0-9+]%', @Temp) > 0 --AND PatIndex('+', @Temp) > 0
Set @Temp = Stuff(@Temp, PatIndex('%[^a-zA-Z0-9+]%', @Temp), 1, '')
Return @Temp
 End

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Question by:sbornstein2
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3 Comments
 
LVL 60

Expert Comment

by:Kevin Cross
ID: 36493410
Add a WHERE clause. Try with:
your_column_to_clean LIKE '%[^a-zA-Z0-9+]%'

You can also do it with the PATINDEX(), but I would try it with the LIKE.
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LVL 60

Accepted Solution

by:
Kevin Cross earned 1000 total points
ID: 36493419
In other words, like this:

UPDATE your_table
SET your_column_to_clean = dbo.KeepNonAlphaCharacters(your_column_to_clean)
WHERE your_column_to_clean  LIKE '%[^a-zA-Z0-9+]%'

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Author Closing Comment

by:sbornstein2
ID: 36493443
cool thanks
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