Before we delve deeper into our JoinRowSet study, let? S issue a simple JOIN command to review what it can do for us.

在深入研究JoinRowSet之前，先发出一条简单的JOIN命令，重温一下它的功能。

youdao

Building an SQL JOIN command starts as a regular SQL SELECT command, but instead of specifying fields from just one table, you can specify fields from more than one table.

构建SQL JOIN命令时，开始仍是常规的SQL SELECT命令，但这里不是仅指定来自一个表的字段，而是指定来自多个表的字段。

youdao

For this, you need to extend your SQL SELECT command using a JOIN.

为此，您需要使用一个JOIN来扩展SQL SELECT命令。

youdao

These forces will join to form "East Command", and are already beginning to share services and resources under the Specialist Crime Division.

BBC: Cash and assets seized from proceeds of crime

Since last autumn, people from outside the EU applying for a visa to join their spouse or partner now have to prove they have a basic command of English before their application is approved.

BBC: Tougher English rules for immigrants on way - Cameron

Even if he were to join forces with the former Prime Minister Mario Monti he would not be able to command a majority there.

BBC: Stalemate in 'ungovernable' Italy after elections