School Database: Assume that you created new table COUNT (Count int). Create another trigger that every time the student table updated its data will registered to COUNT table. The COUNT table will show the total data registered in the student table.
Question
School Database: Assume that you created new table COUNT (Count int). Create another trigger that every time the student table updated its data will registered to COUNT table. The COUNT table will show the total data registered in the student table.
Solution
To create a trigger that updates the COUNT table every time the student table is updated, you can use the following SQL commands:
Step 1: First, ensure that you have the necessary permissions to create a trigger in your database.
Step 2: Create the trigger. Here's an example of how you can do this:
CREATE TRIGGER update_count
AFTER UPDATE ON student
FOR EACH ROW
BEGIN
INSERT INTO COUNT (Count) VALUES ((SELECT COUNT(*) FROM student));
END;
In this example, update_count is the name of the trigger, AFTER UPDATE ON student specifies that the trigger should be executed after any update operation on the student table. FOR EACH ROW means that the trigger will be executed for each row that is updated.
The BEGIN ... END; block contains the SQL commands that will be executed when the trigger is fired. In this case, it inserts a new row into the COUNT table. The value inserted is the current number of rows in the student table, which is obtained with the COUNT(*) function.
Please note that the exact syntax might vary depending on the specific SQL dialect you are using.
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