如果语句涉及到更大的表格和两个或者更多个表的连接的话，查询访问计划就很可能会因为基数估计值的提高而改变。

Statements involving larger tables and joins of two or more tables are more likely to exhibit a change in query access plan as a result of the improved cardinality estimate.

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这个基数会大大影响连接顺序和连接方法。

Cardinality affects join orders and join methods to a large extent.

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