Having fined-grained database tables means more table joins and accordingly more complex queries.

细粒度的数据表意味着更多数据表连接，相应的查询也会更复杂。

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Writing SQL queries that use these more advanced table joins will be addressed in future articles.

编写使用这些比较高级的表连接的 SQL 查询将在后续文章中介绍。

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Furthermore, querying decomposed XML data can be challenging, often requiring multi-table joins.

另外，查询分解的XML数据很困难，常常需要多表联结。

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The 21-year-old joins a Baggies side in 16th place in the table, two points off the relegation zone and struggling for their Premier League survival.

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Phil Vickery became England's latest casualty on Tuesday after he was ruled out for at least three months because of a neck injury, and joins a growing list of injured players such as Andrew Sheridan and Delon Armitage on the treatment table.

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