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Find, Extract and Replace Data in a Field

Posted on 2006-05-25
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Last Modified: 2008-03-06
Okay, here's a stumper. I know there are you experts out there who know a lot more about T-SQL than I will ever know. But then, I was an electrician for 14 years before becoming a programmer, so at least I can wire up your house.

I am doing a system conversion. The current employee table has, like most, a first and last name. I am adding a column to the new table called CommonName. So if your name is William Smith, but you go by Bill, the FirstName column would contain William and the CommonName field would contain Bill.

Here is where it gets tricky. In the current system, if a person uses a common name, HR will enter 'William (Bill)' or 'William "Bill"'. Do you see where I am going with this yet?

I want to find either a " or a '(' in the field, extract the information from that point to the 'closing token - either a " or ')', strip out the 'tokens' and put the result in the CommonName field, and update the FirstName field with the data up to the 'token'. In other words, I would replace 'William (Bill)' with 'William' and put Bill in the CommonName field. I'll bet it can be done in T-SQL, I just don't know how.
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Question by:dbbishop
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4 Comments
 
LVL 34

Expert Comment

by:Brian Crowe
ID: 16765365
SELECT RTRIM(SUBSTRING(@text, 1, CHARINDEX(@delim, @text) - 1)) AS FirstName,
      SUBSTRING(@text, CHARINDEX(@delim, @text) + 1, LEN(@text) - CHARINDEX(@delim, @text) - 1) AS CommonName
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LVL 34

Expert Comment

by:Brian Crowe
ID: 16765380
oops...little premature on that one

DECLARE @delim char(1)
SET @delim = '"'

UPDATE myTable
SET FirstName = RTRIM(SUBSTRING(FirstName, 1, CHARINDEX(@delim, FirstName) - 1)),
   CommonName = SUBSTRING(FirstName, CHARINDEX(@delim, FirstName) + 1, LEN(FirstName) - CHARINDEX(@delim, FirstName) - 1)

run it twice with each delimiter '(' and '"'
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Brian Crowe earned 1500 total points
ID: 16765386
that should have read...

run it once with each delimiter '(' and '"'
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LVL 15

Author Comment

by:dbbishop
ID: 16765507
BriCrowe,

It works when there is a delimiter, but if there isn't, I get an error (Invalid length parameter passed to the substring function.)

I made the following change and it works.

UPDATE tblEmployees
SET FirstName = CASE WHEN CHARINDEX(@delim, FirstName) = 0 THEN FirstName
        ELSE RTRIM(SUBSTRING(FirstName, 1, CHARINDEX(@delim, FirstName) - 1)) END,
CASE WHEN CHARINDEX(@delim, FirstName) = 0 THEN ''
        ELSE SUBSTRING(FirstName, CHARINDEX(@delim, FirstName) + 1, LEN(FirstName) - CHARINDEX(@delim, FirstName) - 1) END
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