... Select query 选择查询 self-join 自联接 semantic object 语义对象 ...
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self join 自连接 ; 自联接 ; 表格自我连结 ; 自我关联
SQL self join 自连接
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As with any join, a self-join requires at least two tables.
与任何联接一样，自联接至少需要两个表。
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Creating a self-join often requires multiple join conditions.
创建自联接通常需要多个联接条件。
Steps for allowing the Query and View Designer to create a self-join.
让查询和视图设计器创建自联接的步骤。
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