PostgreSQL supports these types of JOIN clauses: INNER JOIN, OUTER JOIN, LEFT OUTER JOIN, RIGHT OUTER JOIN, FULL OUTER JOIN, SEMI JOIN, and NATURAL JOIN.
PostgreSQL รองรับคำสั่ง JOIN ประเภทเหล่านี้: INNER JOIN, OUTER JOIN, LEFT OUTER JOIN, RIGHT OUTER JOIN, FULL OUTER JOIN, SEMI JOIN และ NATURAL JOIN
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