Hi,
I need in the SELECT query extract substring 'cccc' from string
'aaa.bbbbb.cccc.dd.eee' (extract third field from string if
delimiter is '.').
It is easy if I know where is begin/end of 'cccc' and I can
use the substring() function:
select substring('aaa.bbbbb.cccc.dd.eee' from 11 for 4);
substr
------
cccc
But how extract it if I don't know where is position of the second
and third '.'?
Yes, I know the function position() or textpos(), but this return first
a position of the substring...
For this exist nice UN*X command "cut -f3 -d." , but how make it in
SQL?
I ask about it, because I write for me this as new function in C, but
I'm not sure if not exist other (better) way for it.
Karel
------------------------------------------------------------------------------
Karel Zak <zakkr@zf.jcu.cz> http://home.zf.jcu.cz/~zakkr/
Docs: http://docs.linux.cz (big docs archive)
Kim Project: http://home.zf.jcu.cz/~zakkr/kim/ (process manager)
FTP: ftp://ftp2.zf.jcu.cz/users/zakkr/ (C/ncurses/PgSQL)
------------------------------------------------------------------------------
