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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.
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The command returns the table to the state it was in before the Oracle updates.
To change the contract number for author A109 to 999, use the statement below.
To set each author contract number to zero, simply leave off the WHERE clause.
If you do not specify a row, then all rows are updated when Oracle update is used.