Every variable has a specific type associated with it. In this case, it is essential that the variable have the same type as the relation column.
If there is any type mismatch, variable assignments and comparisons may not work the way you expect.
Have you ever had one of those moments where you’ve just completed importing 1.7 million user records from flat files into an normalized set of ATG Personalization tables, plus some custom tables, and you only then realize that the passwords from the old system, while in the compatible md5sum format, are all UPPERCASE, while ATG uses all lowercase hashes? I’m happy to override ATG behavior when I should, but this just felt wrong.
I figured the two possible solutions were as follows: The issue with option 1 is that it means overriding the perfectly good out of the box behavior of ATG Profiles for the life of the application due to a set of awkward initial data.
Two popular reasons to use compound trigger are: CREATE OR REPLACE TRIGGER compound_trigger_name FOR [INSERT|DELETE]UPDATE [OF column] ON table COMPOUND TRIGGER -- Declarative Section (optional) -- Variables declared here have firing-statement duration.
--Executed before DML statement BEFORE STATEMENT IS BEGIN NULL; END BEFORE STATEMENT; --Executed before each row change- : NEW, : OLD are available BEFORE EACH ROW IS BEGIN NULL; END BEFORE EACH ROW; --Executed aftereach row change- : NEW, : OLD are available AFTER EACH ROW IS BEGIN NULL; END AFTER EACH ROW; --Executed after DML statement AFTER STATEMENT IS BEGIN NULL; END AFTER STATEMENT; END compound_trigger_name; Hopefully this example with make things more clear. SALARY IS NULL) ) THEN v_index := v_index 1; v_emp_changes(v_index).upd_dt := SYSDATE; v_emp_changes(v_index).upd_by := SYS_CONTEXT ('USERENV', 'SESSION_USER'); v_emp_changes(v_index).emp_id := : NEW.emp_id; v_emp_changes(v_index).field := 'SALARY'; v_emp_changes(v_index).from_value := to_char(: OLD.
The IF/THEN statement checks a Boolean value or expression and if true, executes the statements in the THEN clause.
*/ BEGIN /* Executable section: procedural and SQL statements go here.
*/ /* This is the only section of the block that is required.
If v_numb is equal to or less than 5, or if it evaluates to NULL, the program control jumps to the statement after the END IF clause.
Note that the THEN clause can contain any number of valid PL/SQL statements.