Step 7: Adding a Table Join operator.

步骤7：添加一个Table join操作符。

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The information needed can be obtained by using the SQL JOIN operator.

需要能够通过使用SQL JOIN操作符来获得这些信息。

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You can tell the type of join (INNER, RIGHT, or LEFT) by the details of the join operator.

可以根据连接操作符的细节判断连接的类型(INNER、RIGHT或LEFT)。

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This provides consumers with a powerful incentive to join the operator to which most of their friends belong which in Mexico nearly always means Telcel.

ECONOMIST: Carlos Slim