Creating a sequence for a varchar2 field in Oracle

Question

I want to create a sequence for this varchar. It would have been easier had it been a number instead of varchar. In that case, I could do

seq_no := se

Answer 1

This can be done by

to_char(seq_no,'FM0000000')

your example can be done by creating sequence in oracle

create sequence seq_no  start with 1 increment by 1;

then

select 'A'||to_char(seq_no.nextval,'FM0000000') from dual;

Right now i have used in dual ..but place this

'A'||to_char(seq_no.nextval,'FM0000000')

in your required query ..this will create sequence as you mentioned

sqlfiddle