Error invalid when you try to convert a varchar2 in number.

I need to extract the four numbers in the middle of a varchar2 (12) and then converted to number. The Middle four are numbers, but the first four may be letters. I tried
TO_NUMBER (substr (wptk.ext_wo_num, 5, 4))
TO_NUMBER (LPAD (wptk.ext_wo_num, 5, 4))
substr (TO_NUMBER (wptk.ext_wo_num), 5, 4)
caste in number

I need to get rid of all 0 which are at first four numbers. Some of the data not 0, and some could have up to three 0 initially. Is it possible to do?
Thank you.

Any ideas how to keep the trailing zeros?

LTRIM will do:

SQL> select ltrim('00010', '0') from dual;

LT
--
10

But it's always nice to see a few examples of data...

Tags: Database

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