Defined virtual columns and virtual tables.

已定义虚拟列和虚拟表。

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If the project includes virtual tables and virtual columns, they are also listed there.

如果项目包含虚拟表和虚拟列，也会在此列出。

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Users can construct virtual columns from any combination of columns within a table and then analyze those virtual columns in turn.

用户可以使用表中任意的列组合构造虚拟列，然后依次分析那些虚拟列。

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Broadcasters' sports websites now contain virtual acres of news and columns, plus plenty of video and sound.

ECONOMIST: Sport and the media are natural bedfellows

Although online dating sites like Match.com and Lavalife have been around since nearly the inception of the commercial Internet, these newer sites are much more elaborate than virtual manifestations of "lonely hearts" columns.

FORBES: Reshaping Reality