Apex page DML Mail Alert Trigger

I have a Trigger and Function which sends mail with "updated" column(s), when i am updating in my back-end (sql developer), i receive a mail with that particular column. But when i do UPDATE directly through Apex Page i get mail listing all columns names indicating all are updated. **Function Code:** create or replace function SNAP_FUN(inTableName in varchar2) return varchar2 is result varchar2(4000); sep varchar2(2) := null; begin for c in (select column_name from user_tab_columns where table_name = inTableName) loop if updating(c.column_name) then result := result || sep || c.column_name; sep := ', '; end if; end loop; return result; end; / **Trigger** create or replace trigger SNAP_TRIG after update on dw.W_SUPPL_SNAPSHOT_CONTROL_G for each row DECLARE X VARCHAR2(4000); begin begin X:=X||('Updated:' || snap_fun('W_SUPPL_SNAPSHOT_CONTROL_G')); end; dlr_send_mail('***.com', 'SUPPLEMENTAL_SNAPSHOT', 'These are the column changes observed' || X , '****', 'host') end;