Question: What is a join in SQL ? Describe the different types of joins and provide an example for each. What is a subquery in SQL

What is a join in SQL? Describe the different types of joins and provide an example for each.
What is a subquery in SQL? Explain the difference between a subquery and a join, and provide an example of when a subquery might be more appropriate to use.
Discuss a real-world scenario where using a join significantly improved data retrieval efficiency.
Describe a situation where a subquery helped simplify a complex query.

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