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1、limits of joins
The maximum number of tables that can be referenced in a single join is 61. This also applies to the number of tables that can be referenced in
the definition of a view.
2、表最多可以有多少
MySQL has no limit on the number of tables. The underlying file system may have a limit on the number of files that represent tables. Individual storage engines may impose engine-specific constraints. InnoDB permits up to 4 billion tables.
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原文地址：http://blog.csdn.net/yanzongshuai/article/details/45789055
