Issue :
ORA-01722: invalid number
Cause:
I. Attempt has been made to insert a character value in integer datatype column
SQL> create table mytest ( one integer , two varchar2(10));
Table created.
SQL> desc mytest
Name Null? Type
----------------------------------------- -------- ----------------------------
ONE NUMBER(38)
TWO VARCHAR2(10)
SQL> insert into mytest values ( 'test' , 'test');
insert into mytest values ( 'test' , 'test')
*
ERROR at line 1:
ORA-01722: invalid number
Solution:
Use integer value to insert into integer datatype column or varchar column
SQL> insert into mytest values ( 1 , 'test');
1 row created.
SQL> insert into mytest values ( 1 , 1);
1 row created.
SQL> commit;
Commit complete.
SQL> select * from mytest;
ONE TWO
---------- ----------
1 test
1 1
II. Same error may also appear if conversion function is used against inappropriate data type columns
SQL> select to_number(TWO) from mytest;
select to_number(TWO) from mytest
*
ERROR at line 1:
ORA-01722: invalid number
SQL> select to_number(ONE) from mytest;
TO_NUMBER(ONE)
--------------
1
1