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For example, a table and a trigger can have the same name (however, to avoid confusion, this is not recommended).A trigger is fired based on a triggering statement, which specifies: statement might include a list of columns. Deptno) AS Amp_list_ Emplist FROM Dept_tab d; The statement level triggers are useful for performing validation checks for the entire statement.You should use the MERGE statement to select rows from one or more sources for insert or update of one or more tables.The decision to perform an insert or update is based on conditions specified by you. It works, but it won't tell you if the value changed, only that the column is being updated (even if the update doesn't change the value).Many applications update all of the columns in a table -- setting them to their old value, rather then trying to figure out exactly which columns have been updated by the client. create or replace trigger test_trigger 2 after update of x,y on test 3 for each row 4 begin 5 if updating( 'X' ) then 6 dbms_output.put_line( 'X is being updated' ); 7 end if; 8 9 if updating( 'Y' ) then 10 dbms_output.put_line( 'Y is being updated' ); 11 end if; 12 end; 13 / Trigger created.create or replace trigger "PASSENGER_BOOKING_T1" AFTER insert on "PASSENGER_BOOKING" for each row begin IF (: NEW.

--------------------------------------------- | PK | Name | Address | Postal Code | --------------------------------------------- | 1 | AA | Street1 | 11111 | | 2 | BB | Street2 | 22222 | | 3 | CC | Street3 | 33333 | --------------------------------------------- --------------------------------------------- | PK | Name | Address | Postal Code | --------------------------------------------- | 1 | AA | Street1 | 11111 | | 2 | BB | Street2 | 44444 | | 3 | CC | Dtreet7 | 33333 | --------------------------------------------- What client wants is the update records and only the updated columns (yes, I know it doesn't make any sense but they use some old system from 1970s and they want to do some logging etc.).

You might omit this clause if you just want to record the fact that the operation occurred, but not examine the data for each row.

Once the trigger is created, entering the following SQL statement: A trigger is either a stored PL/SQL block or a PL/SQL, C, or Java procedure associated with a table, view, schema, or the database itself.

What's more, we can wrap up the whole transformation process into this one Oracle MERGE command, referencing the external table and the table function in the one command as the source for the MERGED Oracle data.

file,10) full (contracts_file) */ * from contracts_file ))) f on d.contract_id = f.contract_id when matched then update set desc = f.desc, init_val_loc_curr = f.init_val_loc_curr, init_val_adj_amt = f.init_val_adj_amt when not matched then insert values ( f.contract_id, f.desc, f.init_val_loc_curr, f.init_val_adj_amt); In Oracle Database 10g, the MERGE statement has been extended to cover a larger variety of complex and conditional data transformations, allowing faster loading of large volumes of data.