In this regard, the query is similar to a left outer join in SQL.

从这种意义上说，查询与 SQL 中的左外连接相似。

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Figure 8 shows that the left outer join operations are cascaded if a rule USES more than one reference column.

图8展示了如果规则使用了多个参考列，那么左外部连接就进行级联。

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In 1806, John Colter, a member of the Lewis and Clark Expedition, left to join a group of fur trappers.

1806年，作为刘易斯和克拉克探险队成员的约翰•科尔特尔离开了探险队而加入一个毛皮猎人小组。

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In eighteen eighty-six, Maggie Tobin left home for the town of Leadville,Colorado, to join a sister and brother who already lived there.

VOA: special.2010.03.08

And it would boost more extreme parties, notably the Left Party, which aspires to join a new left-wing coalition at the election after this one (the SPD insists it will not work with the Left Party this time).

ECONOMIST: The battle of the chancellorship | The

At least a dozen congregations have already left to join Lutheran Congregations in Mission for Christ, a small association of conservative churches.

ECONOMIST: Homosexuality in the Lutheran church

The group was founded by Bosco Ntaganda, was an officer in the Rwandan army before he left to join a rebel movement in DR Congo.

BBC: DR Congo's M23 rebels declare unilateral ceasefire