There is also a full outer join between these two sub queries based on a column called sc.
在基于名为 sc 的列上还有两个子查询的完全外连接。
In these cases, keep in mind that the local processing of a full outer join may also impact performance.
这种情况下，请记住，完全外连接的本地化处理也会影响性能。
A full outer join in which all rows from both tables will be included, even if they do not have matches in the related table.
外部联结，将包括左边资料表的所有资料列，即使该资料列在相关资料表并没有相符项目。
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