A SQL Trigger is a special type of stored procedure that automatically executes on the server database when event occurs. Data manipulation language for a user to execute DML (DML) triggers when someone tries to modify the data. DML event insert, update, or delete statement on a table or view. Fire trigger when a valid event, to be fired regardless of whether or not any table rows are affected. see a simple code.
:sales_date:=sysdate;
when form will run current date will appear automatic into sales_date field.
when-form-instance

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