ORA Error « System Packages « Oracle PL / SQL

1.ORA-00918: column ambiguously defined
2.ORA-00934: group function is not allowed here
3.ORA-00979: not a GROUP BY expression
4.ORA-01403: no data found
5.ORA-01403: no data found exception from procedure
6.ORA-01422: exact fetch returns more than requested number of rows
7.ORA-01426: numeric overflow
8.ORA-01839: date not valid for month specified
9.ORA-06502: PL/SQL: numeric or value error

10.ORA-06502: PL/SQL: numeric or value error: character to number conversion error
11.ORA-06502: PL/SQL: numeric or value error: number precision too large
12.ORA-06503: PL/SQL: Function returned without value
13.ORA-14551: cannot perform a DML operation inside a query