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SQL Delete all data after character

Posted on 2013-01-14
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Last Modified: 2013-01-14
I have a table that contains # signs and I need to delete all of the data BEFORE the # signs

Example Data:


qid	                qtext
1                      Weather#Sunny
2                      Weather#Rainy and cloudy
3                      Weather#Windy and foggy with possible rain

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Question by:swaggrK
9 Comments
 

Author Comment

by:swaggrK
ID: 38775707
Also, data can appear like...

qid	                qtext
1                      Weather#Sunny
2                      Weather#Rainy and cloudy
3                      Weather#Windy and foggy with possible rain
4                      Report#Breezy and foggy with possible rain
5                      Weather Report#Snowy and partly cloudy
                                  

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Expert Comment

by:Jim Horn
ID: 38775712
Get the character index of the #, then take the left characters right before that index.

SELECT LEFT('Weather#Sunny', CHARINDEX('#', 'Weather#Sunny') - 1)

returns 'Weather'
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LVL 92

Expert Comment

by:Patrick Matthews
ID: 38775748
This is a twist, which returns the whole string if there is no # character:

SELECT LEFT(qtext, CHARINDEX('#', qtext + '#') - 1) AS Shorter
FROM SomeTable

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As an update:

UPDATE SomeTable
SET qtext = LEFT(qtext, CHARINDEX('#', qtext + '#') - 1)

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Accepted Solution

by:
Steve Wales earned 125 total points
ID: 38775754
I think you're wanting the text AFTER the # sign, so if so:

select SUBSTRING(qtext, CHARINDEX('#', qtext,) + 1, LEN(qtext))

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You could wrap an RTRIM() fuction around that as well to chop off any trailing spaces if it's an issue.

Pulling a substring for length greater than the total length of the string doesn't seem to bother SQL Server but if you wanted to work out the exact length by subtracting the start position of the # via another CHARINDEX call, that would be an option too.
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LVL 65

Expert Comment

by:Jim Horn
ID: 38775811
>think you're wanting the text AFTER the # sign
Doh.  Misread the question.

sjwales' comment is correct, although after a typo /  comma is deleted

 
Declare @qtext varchar(50) = 'Weather#Sunny'

select SUBSTRING(@qtext, CHARINDEX('#', @qtext) + 1, LEN(@qtext))

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Author Comment

by:swaggrK
ID: 38775890
Yes, I want to KEEP the text AFTER the # sign.

So, my results would look like...

BEFORE:

qid	                qtext
1                      Weather#Sunny
2                      Weather#Rainy and cloudy
3                      Weather#Windy and foggy with possible rain
4                      Report#Breezy and foggy with possible rain
5                      Weather Report#Snowy and partly cloudy



AFTER:

qid	                qtext
1                      Sunny
2                      Rainy and cloudy
3                      Windy and foggy with possible rain
4                      Breezy and foggy with possible rain
5                      Snowy and partly cloudy

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Author Comment

by:swaggrK
ID: 38775938
I am still not sure how to accomplish this based on the previous suggestions. Thnx.
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Assisted Solution

by:Jim Horn
Jim Horn earned 75 total points
ID: 38775943
<point of order>
The title of this question is 'SQL Delete all data after character', but in the body it states the question is to delete all data before the # character.  Gotta be careful.
</point of order>

So, borrowing from the above, if you wish to permanently change the table so that the text before the # is deleted....

UPDATE YourTableName
SET qtext = SUBSTRING(qtext, CHARINDEX('#', qtext) + 1, LEN(qtext))
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Author Comment

by:swaggrK
ID: 38775963
@jimhorn...thanks for the <point of order>

Also, this worked perfectly...THANKS!
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