What is a subquery in SQL, and how is it different from a regular query?
- A subquery is a query nested within another query
- A subquery is always used with the SELECT statement
- A subquery is more efficient than a regular query
- A subquery is used to retrieve data from multiple tables
A subquery in SQL is a query nested within another query, often used within the WHERE or HAVING clause. It is different from a regular query as it is embedded within another query and helps in retrieving data based on certain conditions or criteria.
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