Teradata String Replace Function

Posted on 2010-08-27
Medium Priority
Last Modified: 2013-11-11

I have a column with values such as:


It is a varchar column. I would like to strip out all periods from it. Is there a Teradata function or set of functions that can help me do that?

Question by:infa008
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LVL 40

Assisted Solution

by:Richard Quadling
Richard Quadling earned 500 total points
ID: 33545855
As you've probably worked out, there is no REPLACE function.

The best I could find was at http://www.teradataforum.com/teradata/20020729_174333.htm

Not exactly pretty, but doable.

Another option, depending upon the amount of data, would be to export it to a file, do a simple search/replace, save it and re-import it.


Assisted Solution

seenall earned 500 total points
ID: 33548710
From the forums also - a bit more chewy example here - this might  be at least more flexible

If you are familiar with installation of User Defined Functions - this library (download) may help http://downloads.teradata.com/download/extensibility/teradata-udfs-for-popular-oracle-functions - remember to install the replace function as oreplace because replace is a keyword
LVL 51

Assisted Solution

by:Mark Wills
Mark Wills earned 500 total points
ID: 34023460
G'Day, just passing through the Teradata Zone and saw this one still open...

Well, there is no simple way of doing it other than a series of substrings being concatenated together....

(case when substr(my_column,1,1) = '.' then '' else substr(my_column,1,1) end)
(case when substr(my_column,2,1) = '.' then '' else substr(my_column,2,1) end)
(case when substr(my_column,3,1) = '.' then '' else substr(my_column,3,1) end)
(case when substr(my_column,4,1) = '.' then '' else substr(my_column,4,1) end)
(case when substr(my_column,5,1) = '.' then '' else substr(my_column,5,1) end)
(keep going for how ever long the string is - need to do every character)

You could probably create the above type of construct as a function... otherwise check those links above - looks like they are talking about functions...
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Accepted Solution

sabeesh earned 500 total points
ID: 34045762
you could repeat the following function twice if the `.` occurs only twice in all the values.

substring(column FROM 1 FOR POSITION(`.` IN column) - 1) || substring(column FROM POSITION(`.` IN column) + 1)
LVL 51

Expert Comment

by:Mark Wills
ID: 34295936
Well all 4 experts posted something to help answer the question, so split amongst all 4.

Expert Comment

ID: 34296023
I agree with the previous poster - All 4 posts were valid, - and this post I suspect will be useful for some time to come until Teradata introduce a pre-compiled replace function
Please apply some point distribution
LVL 70

Expert Comment

ID: 34296087
The issue is that we do not know if the proposed solutions really hit what was intended to request. So either all or nothing to accept. All recommendations are valid, but most are completely oversized. Only sabeesh's solution is exactly fitting, because it consideres two dots only. On the other hand, "strip out all periods" could also mean there are more than two, and in that case sabeesh's solution does not fit at all. I really cannot determine which answers are really correct for this case, only the asker can, hence I recommended deletion.

Cleanup Volunteer
LVL 51

Expert Comment

by:Mark Wills
ID: 34296144
Yep, completely understand the reasoning. And the comments have been posted to position accordingly.

But it is a good thread for Terradata "replace" in case anyone else needs it.

Sabeesh can have the "accepted" gong, the rest can be assists because they do provide good information.

Hard one to really score, but think there is value here.

Expert Comment

ID: 34296216
without parroting - all comments are valid - Hopefully congratulations go to Sabeesh -

An interesting case that I shall certainly bookmark

Expert Comment

by:South Mod
ID: 34332928
Following an 'Objection' by mark_wills (at http://www.experts-exchange.com/Q_26664006.html) to the intended closure of this question, it has been reviewed by at least one Moderator and is being closed as recommended by the Expert.
At this point I am going to re-start the auto-close procedure.
Thank you,
Community Support Moderator

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