Outer join in which all rows from the table represented on the left will be included, even if they do not have matches in the related table.
外部联结，将包括右边资料表的所有资料列，即使该资料列在相关资料表中并没有相符项目。
Outer join in which all rows from the table represented on the left will be included, even if they do not have matches in the related table.
外部联结，将包括右边资料表的所有资料列，即使该资料列在相关资料表中并没有相符项目。
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