...半连接（Semi Join）：使用了子查询的情况下，所实现的主查询与子查询之间的连接。通常，使用IN、EXISTS时，优化器会制定半连接。
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... 双半式连接卸扣 kenter shackle 半连接运算 Semi join 半永久连接 Semi-Permanent Connection ; SPC ...
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半联接
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Semi-Join 半联接 ; 半连接
Left Semi join 左半连接
Right Semi Join 右半连接
semi-join operation 半联接操作
multiple relations semi join 多关系半连接
join semi-lattice 并半格
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