on子句条件完全在联接级别应用。

The on clause condition is applied entirely at the join level.

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可以向where子句添加一个或多个搜索条件。

You can add one or more search conditions to a WHERE clause.

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可以向where子句添加一个或多个搜索条件。

You can add one or more search conditions to a WHERE clause.

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