left outer join
时间: 2023-09-10 07:11:39 浏览: 109
在SQL中,left outer join是一种连接两个表的方法,它返回左边表中所有的行,以及与右边表中匹配的行。 left outer join和left join其实是相同的,只是多了一个outer的描述。 这种连接方法常用于查询需要返回左边表的所有数据,而右边表的数据只有在匹配的情况下才会返回。在关联维表时,个人习惯可能会选择使用left outer join,而不是left join。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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