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with tab as ( select 'Cleveland' as City, '2164445437/FTTD/JAMES, TYLER/139561151' as Emp_Num_ID from dual union all select 'Tokyo' as City, '1261120379/FTTD/BOYD, ADAMS/14468140' as Emp_Num_ID from dual union all select 'Marakech' as City, '4049838896/FTTD/SMITH, TULY E/13956144' as Emp_Num_ID from dual union all select 'Houston' as City, '7980151429/FTTD/NEARY, HARTMAN/14215411' as Emp_Num_ID from dual ) select City, substr(Emp_Num_ID,instr(Emp_Num_ID,'/',-1)+1) as id from tab where substr(Emp_Num_ID,instr(Emp_Num_ID,'/',-1)+1) = City
-- this cause an exception ORA-01722: invalid number -- because you compare 14215411c with 4 with tab as ( select 4 as City, '7980151429/FTTD/NEARY, HARTMAN/14215411c' as Emp_Num_ID from dual ) select City, substr(Emp_Num_ID,instr(Emp_Num_ID,'/',-1)+1) as id from tab where substr(Emp_Num_ID,instr(Emp_Num_ID,'/',-1)+1) = City
ORA-01722: invalid number