多表连接
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Join Multi-Table Tournament 加入复合桌锦标赛
Multi-table join is one of the most time-consuming operations in the Online Analytical Processing based on relations.
基于关系存储的联机分析处理(ROLAP)通常会涉及多表连接操作。
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For example, using SQL to create a multi-table outer join that outputs its results to a new XML document is much more complicated to the average developer than writing XQuery.
比方说，对于一般开发人员，使用SQL创建输出结果为新xml文档的多表外连接查询要比编写XQuery复杂得多。
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