Sqlite replace a column value with a substring value

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I have a table with 399 records that have a full path in the the Filename column. I can trim the filename to the last '\' using the following;

SQL

select replace(Part.Filename, rtrim(Part.Filename, replace(Part.Filename, '\', '')), '') from Part

What I want to do is replace the filename with the trim value for each record.
i.e., If I have:

c:\somedir\somesubdir\somefile.txt

replace with:

somefile.txt

Any help appreciated!

What I have tried:

I tried:

SQL

update Part set Filename = (select replace(Part.Filename, rtrim(Part.Filename, replace(Part.Filename, '\', '')), '') from Part)

but it replaced all records with a single value.

Posted 7-Sep-23 7:27am

Mike Hankey

Updated 8-Sep-23 4:31am

Deeksha Shenoy

v2

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PIEBALDconsult 7-Sep-23 14:01pm

Maybe use INSTR() to find the backslashes, but I think you would then have to loop until there are none.

2 solutions

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raddevus · Accepted Answer · 2023-09-07T08:22:00

Solution 1

I believe you want to do a multiple-row update.
Multiple-row updates are difficult -- the syntax is odd.
However, in recent times a new thing has arisen : CTE (Common Table Expression).

Here's the official sqlite doc on that including an example that you should be able to manipulate for your purposes: UPDATE[^]

Posted 7-Sep-23 8:22am

raddevus

v2

Comments

Maciej Los 7-Sep-23 14:36pm

5ed!

Mike Hankey · Accepted Answer · 2023-09-07T09:03:00

Solution 2

[update]

Believe it or not I did this and it worked;

SQL

update Part set Filename = (select replace(Part.Filename, rtrim(Part.Filename, replace(Part.Filename, '\', '')), ''))

by removing the from Part from the query it updates nicely!

Thanks everyone for your input!
[/update]

Posted 7-Sep-23 9:03am

Mike Hankey

Comments

PIEBALDconsult 7-Sep-23 16:45pm

Please don't try to answer your own question, just use the Improve question button at add detail.

But seriously, may I bother you with something which is causing me some trouble?

Richard Deeming 8-Sep-23 3:49am

There's nothing wrong with answering your own question, so long as:

a) it's actually an answer;
b) it's not a copy of someone else's answer; and
c) you didn't already know the answer when you posted the question, and only posted both to gain the rep points.

This answer is fine on all three counts. :)

Mike Hankey 7-Sep-23 16:47pm

sure

Maciej Los 11-Sep-23 15:23pm

5ed!