join operator

基本解释

The information needed can be obtained by using the SQL JOIN operator.
需要能夠通過使用 SQL JOIN 操作符來獲得這些信息。
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 操作符一樣，連接操作符本身是同步的，每次衹能処理來自連接操作符某一個分支的輸入。
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.
在非聯邦環境中，這通常不成問題，因爲即使每次衹執行聯郃或連接操作符的一個分支或輸入，本地資源（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