If there is an index on the join column, the costs will be significantly less; otherwise the database server must perform table scans for all tables, both outer and inner tables.
如果连接列上有一个索引，那么其成本会相当低；否则，数据库服务器就必须对所有表(外部和内部表)执行表扫描。
Create an expression that performs an inner equi-join on the ID columns in the two result sets by clicking the... button or by specifying it manually.
通过单击…按钮或手动指定，创建一个表达式，该表达式执行两个结果集中的id列上的内部相等连接。
The merge statement first does a join (outer join or inner join, depending on the merge statement) between source and target table rows.
merge语句首先进行(外部联接或者内部联接，取决于merge语句)源与目标表行之间的联接。
By default, related tables are joined using an inner join that creates a result set based on rows containing matching information in the join columns.
默认情况下，相关表通过使用内部联接进行联接，该内部联接基于包含联接列中匹配信息的行创建结果集。
By default, related tables are joined using an inner join that creates a result set based on rows containing matching information in the join columns.
默认情况下，相关表通过使用内部联接进行联接，该内部联接基于包含联接列中匹配信息的行创建结果集。
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