SQL>
SQL> accept x prompt "Enter date[yyyy-mm-dd]: "
Enter date[yyyy-mm-dd]:
SQL> select date '&x' as input_date
2 , to_char(date '&x', 'ww') as ww
3 , to_char(date '&x', 'iw') as iw
4 from dual;
old 1: select date '&x' as input_date
new 1: select date '' as input_date
old 2: , to_char(date '&x', 'ww') as ww
new 2: , to_char(date '', 'ww') as ww
old 3: , to_char(date '&x', 'iw') as iw
new 3: , to_char(date '', 'iw') as iw
select date '' as input_date
*
ERROR at line 1:
ORA-01841: (full) year must be between -4713 and +9999, and not be 0
SQL>
SQL> undefine x
SQL>