此外怎么办LEFT JOIN,RIGHT JOIN和FULL JOIN适合吗？
LEFT JOIN
RIGHT JOIN
FULL JOIN
sql database join inner-join outer-join
LEFT JOIN和之间有什么区别LEFT OUTER JOIN？
LEFT OUTER JOIN
t-sql sql-server left-join outer-join
outer-join ×2
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inner-join ×1
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left-join ×1
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