For example, a zip code lookup relationship might map the phone area code "650" to the zip codes "94010," "94305," and so on.

例如，邮政编码查询关系可以将电话区号“650”映射到邮政编码“94010”、“94305”等。

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In North America it starts with three Numbers called the area code, followed by seven digits split into sections of three and four, which is the local number.

在北美，该号码的开头为3个数字，称为区号，然后是7个数字，分为两部分，一部分3个数字，一部分4个数字，这是本地号码。

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Now let's say you want to find the city for each company based on their telephone area code. In this case, you can run a query like this.

现在，假设希望根据每家公司的电话区号找到它们所在的城市。

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The four outer boroughs now use the 718 area code--but the number shortage is now squeezing the heart of the city: Manhattan.

ECONOMIST: The sexiest code on earth

So Nynex, hardly the most popular local telephone company in America, knew it was in for a scrap when it recently unveiled a plan to deprive some Manhattanites of their treasured 212 area code--arguably the only local telephone code that is recognised from Tokyo to Tomsk.

ECONOMIST: The sexiest code on earth

Before a crowd of 400, with music blaring and bright lights pulsing, four entrepreneur finalists, screened for their business plans, competed in a speed round of area code numbers for high-tech centers from west to east.

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