join operator

基本解释

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。
As with the UNION operator, the join operator itself remains synchronous and is only able to process input from one leg of the join at a time.
和 UNION 操作符一样，连接操作符本身是同步的，每次只能处理来自连接操作符某一个分支的输入。
In a non-federated environment, this is not generally an issue, as local resources (CPU, I/O) are usually adequately utilized by performing one leg or input of a union or join operator at a time.
在非联邦环境中，这通常不成问题，因为即使每次只执行联合或连接操作符的一个分支或输入，本地资源（CPU、I/O）通常也得到了充分的利用。

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