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数据库/SQL
不同的 SQL JOIN
不同的 SQL JOIN
INNER JOIN
：如果表中有至少一个匹配，则返回行
LEFT JOIN
：即使右表中没有匹配，也从左表返回所有的行
RIGHT JOIN
：即使左表中没有匹配，也从右表返回所有的行
FULL JOIN
：只要其中一个表中存在匹配，则返回行
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