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SQLJOIN命令时，开始仍是常规的SQLSELECT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。
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SQLJOIN命令时，开始仍是常规的SQLSELECT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。
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