Sql Trigger Examples on Library Database – Query Examples

Sql Trigger Examples on Library Database

In this post We will write some trigger examples on library database. There will be about 30 examples in this article. I hope you will like this examples. This examples will help you to learn how to write triggers.

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Example 1: Trigger prevents the entry of data to student table

——-Method 2

Example 2: Trigger to prevent student addition to class 10A

Example 3: The trigger that prevents students from updating their classes and genders at the same time

Example 4: Trigger that prevents the addition of type names with less than six characters

Example 5: The trigger prevents to delete more than one records on borrows table at one time

Example 6: Trigger that prevents updating the student names

——–Method 2

Example 7: The trigger, adds points to students that up to the points of the book.

Example 8: The trigger prevents to delete the student. It updates the student’s points to zero

Example 9: The trigger prevents to take book(type drama) of students which class level nine

Example 10:  The trigger lets:The length of student names must be between 5 and 10 characters.

Example 11: The trigger prevents to lend books that has not been brought yet.

Example 12: When a student add to student table,add a borrow record with randomly selected book.

———-Method 2

Example 13: The student’s birthdate who will be added to the students table must be bigger than 2003

Example 14:A student can get only one book in the same day.

Example 15:Increase the point of each borrowed book by 1 point

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