You can then use an SQL inner join to get the frequency with which each company in the list is mentioned, as in Listing 10.

然后您可以使用一个SQL inner join语句来得到列表中每个公司被提到的频率，如清单10所示。

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You could also write the SQL Command to explicitly mention the INNER part of the join.

您也可以编写SQL命令显式地提到JION的INNER部分。

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