You can also insert data using the 'traditional' method you'd use when using a command line or SQL Plus.
Return to the SQL Worksheet and enter the command: Insert into departments (DEPARTMENT_ID, DEPARTMENT_NAME) Values (300, 'Research'); Click F9.
What I think you're saying is that table 2 is a duplicate of table 1.
Here's some pseudo-code for how you'd put the trigger together: CREATE TRIGGER . This reduces the possibility of locking conflicts and also relieves the burden of activity caused by deleting and entire table just to turn around and replace it again with only minor changes.
In Oracle, a sequence object (created by CREATE SEQUENCE statement) is used to generate IDs (auto-increment, identity values).
In relational databases, the Log trigger or History trigger is a mechanism for automatic recording of information about changes inserting or/and updating or/and deleting rows in a database table. These two additional columns define a period of time of "validity" of the data associated with a specified entity (the entity of the primary key), or in other words, it stores how the data were in the period of time between the is not included.
2) Statement level trigger - An event is triggered for each sql statement executed.
PUT_LINE('Record successfully inserted into emp_backup table'); END; Second Problem: We want o update a record in the ’emp_backup’ table if a corresponding record is updated in the ’emp’ table.
As we’ve already created both the tables in above example, we will directly write a trigger for ‘AFTER UPDATE’.
CREATE or REPLACE TRIGGER emp_after_update AFTER UPDATE OF empid ON emp FOR EACH ROW DECLARE BEGIN update emp_backup set empid = :new.empid where empid = :old.empid; DBMS_OUTPUT.
PUT_LINE('empid successfully updated into emp_backup table'); END; The above trigger named ’emp_after_update’ will be initiated whenever ’empid’ column in ’emp’ table gets updated.