trigger

hi,
please tell the meaning of the following:
1) create trigger to trap some data entry errors like entering the age to be less than 10. A trigger on the database table sailors would trap such an error.
2)write active rules for a)the amount of loans should not exceed one lakh,or b) on gross salary 5 times.

re: trigger

If you do not know the meaning of the question, why you have posted it here.
Whom do you expect to know the meaning of your question and explain that back to you ?