Why does SQL injection happen?

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Tags

1. #application
2. #severe
3. #parameter
4. #queries
5. #input
6. #values
7. #server
8. #cookie
9. #validate
10. #attacks
11. #occur
12. #consequences
13. #usually
14. #attack
15. #passing
16. #database
17. #executed
18. #received
19. #before
20. #injection