What does SQL stands for? Why is SQL such a powerful language? Why is a Join in SQL so powerful. What does it do, how does it work. Why is by

1. What does SQL stands for? Why is SQL such a powerful language?
2. Why is a Join in SQL so powerful. What does it do, how does it work.
3. Why is by Query-By-Example so popular?. How does it work. Give an example you have experienced. Why is it the better choice for the application.

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