Life Plan Database: Create a trigger that after each customer was inserted the BILL table also updates.

Sure, here is a step-by-step guide on how to create a trigger in SQL that updates the BILL table after each customer is inserted into the CUSTOMER table.

1. First, you need to define the trigger. You can do this using the CREATE TRIGGER statement. The syntax for creating a trigger is as follows:

CREATE TRIGGER trigger_name 
AFTER INSERT 
ON table_name 
FOR EACH ROW 

2. Next, you need to specify what action should be taken when the trigger is activated. In this case, you want to update the BILL table. You can do this using the UPDATE statement. The syntax for updating a table is as follows:

UPDATE table_name 
SET column1 = value1, column2 = value2, ...
WHERE condition;

3. Putting it all together, your trigger might look something like this:

CREATE TRIGGER update_bill 
AFTER INSERT 
ON CUSTOMER 
FOR EACH ROW 
BEGIN 
   UPDATE BILL 
   SET column1 = value1, column2 = value2, ...
   WHERE condition;
END;

Please replace column1, value1, column2, value2, and condition with the actual column names, values, and condition that apply to your situation.

4. Finally, you need to run this SQL command in your database management system to create the trigger.

Please note that the exact syntax might vary slightly depending on the specific database management system you are using.