Question

Possible Duplicate:
How to replace string in SQLite?

I have a table column data as

/var/abc/23423423/Documents/apple.jpg

/var/sdg/64444223/Documents/Banana.jpg

I want to update this column so that anything preceding /Documents is removed.
So output should be:

/Documents/apple.jpg

/Documents/Banana.jpg

How do I achieve this using UPDATE Statement of SQL?

Answer 1

Something like this will work:

UPDATE yourtable
SET yourfield = MID(yourfield,INSTR(yourfield,"/Documents/"));

INSTR locates the position of the string /Documents/, and MID gets everything beginning from there.

Notes:

1. This maybe won’t work as you expect it when you have something like
   /Documents/Documents/ in your path string.
2. Depending on your RDBMS
   MID and INSTR may not be available, but most RDBMS support them.

Updates:

After my reply you’ve updated that SQLite is the RDBMS of your choice – this makes things more difficult. There ain’t no INSTR in SQLite, so most people will advise you to parse the result with a program, change it there and update the data then – for example in this SO post.

However… since your two examples both have a fixed directory name length (in total 18 characters), there is the tiny chance that in your case you could do it slightly easier:

UPDATE yourtable
SET yourfield = SUBSTR(yourfield,18);

I haven’t tried this yet, but maybe this works for you.