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单选题
以下哪条SQL语句可以返回table1中的全部的key：
A select tabel1.key from table1 join tabel2 on table1.key=table2.keyB select tabel1.key from table1 right outer join tabel2 on table1.key=table2.keyC select tabel1.key from table1 left semi join tabel2 on table1.key=table2.keyD select tabel1.key from table1 left outer join tabel2 on table1.key=table2.key正确答案: D可在小程序上查看本题解析，扫码查看
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