SQL Joins | INNER JOIN, OUTER JOIN, LEFT JOIN, RIGHT JOIN

INNER JOIN
Returns only the records with matching values in both tables.

LEFT JOIN (or LEFT OUTER JOIN)
Returns all records from the left table, and matched records from the right table. If there's no match, NULLs are returned for right table columns.

RIGHT JOIN (or RIGHT OUTER JOIN)
Returns all records from the right table, and matched records from the left table. If there's no match, NULLs are returned for left table columns.

FULL OUTER JOIN
Returns all records when there is a match in either left or right table. If there is no match, NULLs are returned for the missing side.
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