SQL Server - Text field update

Posted on 2013-01-08
Last Modified: 2013-01-08

I have a table of approx 1000 records in SQL Server 2008 and I need to update a text field containing email addresses.  I need to remove all text to the right of, and including, the first # symobol and retain the left hand part of the address.

Question by:qjump
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LVL 22

Expert Comment

by:Steve Wales
ID: 38755428
Try something like this:

Update yourtable
set email_address = substring('', 1, charindex('#', '')-1)

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(Playing with using a variable instead of hard coding the string twice, but it isn't working yet, but thought I'd get this your way for starters)
LVL 13

Expert Comment

ID: 38755438
You can try something like this:

UPDATE yourTable
SET yourField = SUBSTRING(yourField,1,CHARINDEX('#',yourField)-1)

To test first, you can try a simple select:

SELECT yourField, SUBSTRING(yourField,1,CHARINDEX('#',yourField)-1)

And adjust accordingly.

Hope it helps.

Expert Comment

ID: 38755452

DECLARE @tbl TABLE (field VARCHAR(150))

insert INTO @tbl (field) VALUES ('')

SELECT field FROM @tbl t

UPDATE @tbl SET field = LEFT(field,CHARINDEX('#',field)-1) 

SELECT field FROM @tbl t

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LVL 92

Accepted Solution

Patrick Matthews earned 295 total points
ID: 38756004
BTW, the above approaches will all throw errors if you have any values without a # character.  Two ways to guard against that:

SET col = LEFT(col, CHARINDEX('#', col) - 1)
WHERE col LIKE '%#%

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SET col = LEFT(col, CHARINDEX('#', col + '#',) - 1)

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