ORA-24347: Warning of a NULL column in an aggregate functionUse the function NVL:https://docs.oracle.com/cd/B19306_01/server.102/b14200/functions105.htmhttps://docs.oracle.com/cd/B28359_01/olap.111/b28126/dml_functions_2048.htm#OLADM624For example:Code: SQL [Select][+][-]SELECT AVG(NVL(Salary,0)) FROM Employee;