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JOIN
clause combines rows from two or more tables based on a common column.
INNER JOIN
returns rows that have matching values in both tables
LEFT JOIN
returns all rows from the left table and the matched records from the right table. If there is no match from the right side, the result is NULL.
RIGHT JOIN
returns all rows from the right table and the matched records from the left table. If there is no match from the left side, the result is NULL.
FULL JOIN
returns all records when there is a match on either the left or right table. If there is no match, the missing side will contain NULL.