Using a code examples, explain what the following are and when you would use them. A subquery and A Join.
Added by Amanda C.
Step 1
It is used to retrieve data that will be used in the main query. Here is an example: SELECT name, age FROM users WHERE age > (SELECT AVG(age) FROM users); In this example, the subquery is "(SELECT AVG(age) FROM users)" which calculates the average age of all Show more…
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