Visual FoxPro多表视图或查询中联接条件的设置

Settings of connection condition in Visual FoxPro multi-table graphs or query

Visual FoxPro中为建立多表视图或查询进行联接条件设置时,在向导和设计器的使用中需要特别注意一些问题,否则联接结果很可能是不正确的。为此,以不同的实例分析了在向导和设计器中设置多表联接条件过程中可能出现的错误,并分析归纳了最简洁有效的正确设置方法。

Some special problems need to be paid attention when setting up connection conditions for multi-table graph and query in Visual FoxPro, otherwise the connection result is very possibly not correct. The errors that may arise during the procedure to set up in wizard and designer are analyzed by using three tables as example. The most concise and effective correct setting method is summarized.