What Is The Syntax Of Nullif Function #292

 Select column_list From table_name Where NULLIF (exp1, exp2); 

 Select column_list, NULLIF (exp1, exp2) From table_name; 

 Select column_list, NULLIF (exp1, exp2,exp3) From table_name; 

 Select column_list From table_name Where NULLIF (exp1);