Better to use a sequence: 
create or replace sequence prod_seq minvalue 1 nomaxvalue start with x
+xxx increment by 1 cache 20 noorder nocycle

[download]
Then your insert select can use the nextval function: 
insert into prod (ss)
 select prod_seq.nextval from dual

[download]
You need to create the sequence only once, but be sure to set the "start with xxxx" to a value higher than anything in your table.

Paul

In reply to Re^3: DBD ERROR: error possibly near <*> indicator at char by Lhamo Latso
in thread DBD ERROR: error possibly near <*> indicator at char by shalu

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