When joining a vessel，do not forget personal documents and your spectacles，and（）if necessary...

第1题

[多选题] In which two cases would you use an outer join?（）

A、The tables being joined have NOT NULL columns. B、The tables being joined have only matched data. C、The columns being joined have NULL values. D、The tables being joined have only unmatched data. E、The tables being joined have both matched and unmatched data. F、Only when the tables have a primary key/foreign key relationship.

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第2题

[多选题] In which two cases would you use an outer join? （）

A、The tables being joined have NOT NULL columns. B、The tables being joined have only matched data. C、The columns being joined have NULL values. D、The tables being joined have only unmatched data. E、The tables being joined have both matched and unmatched data. F、Only when the tables have a primary key/foreign key relationship.

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第3题

[多选题] In which two cases would you use an outer join? （）

A、The tables being joined have NOT NULL columns. B、The tables being joined have only matched data. C、The columns being joined have NULL values. D、The tables being joined have only unmatched data. E、The tables being joined have both matched and unmatched data. F、Only when the tables have a primary key-foreign key relationship.

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第4题

[单选题] 关于HQL的连接查询，说法错误的是（）。

A、inner join 或 join用于内连接 B、inner join fetch或 join fetch用于迫切内连接 C、left outer join fetch 或 left join fetch用于迫切左外连接 D、right outer join fetch 或 right join fetch用于迫切右外连接

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第5题

[单选题] When did the Republic of Ireland join the EC?（）

A、In 1952. B、In 1955. C、In 1973. D、In 1975.

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第6题

[多选题] In a design situation, there are multiple character sets that can properly encode your data. Which three should influence your choice of character set?（）

A、Syntax when writing queries involving JOINS B、Memory usage when working with the data C、Character set mapping index hash size D、Disk usage when storing data

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第7题

[多选题] 交换机SWA，SWB和SWC连接形如：SWA——SWB——SWC。三台交换机都正确配置了GVRP协议，以便互相通告VLAN信息如果在SWA上手工创建VLAN2，下列描述正确的是（）。

A、SWA马上向SWB发送第一个Join信息，再等待Jointimer时间发送第二个Join消息 B、SWA等待Holdtimer时间向SWB发送第一个Join消息，再等待Jointime时间发送第二个Join消息 C、SWB接收到第一个Join消息之后马I向SWC发送第一个Join信息，再等待Jointime时间发送第二个Join消息 D、SWB接收到第一个Join消息之后等待Holdtimer时间向SWC发送第一个Join消息，再等待Jointimer时间发送第二个Join消息

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第8题

[单选题] We are planning an outing.（） Sure.

A、Where are you going? B、When will you leave? C、How is everything? D、Do you want to join us?

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第9题

[单选题] Evaluate this SQL statement: In the statement, which capabilities of a SELECT statement are performed?（）

A、Selection, projection, join B、Difference, projection, join C、Selection, intersection, join D、Intersection, projection, join E、Difference, projection, product

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When joining a vessel，do not forget personal documents and your spectacles，and（）if necessary.

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