What are triggers How do you use them?

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Tags

1. #executed
2. #insert
3. #activated
4. #associated
5. #table
6. #following
7. #object
8. #action
9. #mysql
10. #after
11. #trigger
12. #defined
13. #event
14. #statements
15. #delete
16. #update
17. #before
18. #invoked
19. #database