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cross join

  • 交叉连接:在数据库中,交叉连接是一种连接类型,它将两个表中的所有行进行组合,产生笛卡尔积。

网络释义

  交叉连接

(2)交叉连接CROSS JOIN):交叉连接所有涉及的表中的所有记录都包含在结果集中。可以采用两种方式来定义交叉连接,分别是隐式和显式的连接。

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  交叉联接

...所有的join语句都跟连接顺序相关1、cross join交叉联接):生成笛卡尔积后,一定不能写on或where条件。

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  笛卡尔乘积

首先都是基于cross join(笛卡尔乘积),然后是inner join,在笛卡尔乘积的结果集中去掉不符合连接条件的行。

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  笛卡尔积

...lass_id class_name student_id student_name 1 a 1 李萌 2 b 2 王武 1 a 3 李浩 3 c null null 交叉连接或笛卡尔积(cross join): 内连接,在连接时,是可以省略连接条件的。意味着,所有的左表的数据,都要与右表的记录做一个连接。

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短语

from tablea cross join tableb 格式

CROSS S JOIN 交叉连接

双语例句权威例句

  • This type of join is called a CROSS join.

    这种类型连接称作交叉连接。

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  • Note: CROSS JOIN may generate too many rows.

    注意交叉连接可能会生成太多

    youdao

  • The first method in the following example shows a simple cross join.

    下面示例中的第一方法演示了一个简单交叉联接

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更多双语例句
  • Labour, who came second in the mayoral vote, refused to join the cross-party cabinet.

    BBC: Bristol City Council cabinet final members announced

  • But there is something about a small town that has never gone a single day, in almost 150 years, without a passenger train pulling in and pausing to see if anyone would like to step out onto the streets of Garden City, or if anyone from Garden City would like to climb aboard and join the other cross-continental travelers...

    CNN: A Kansas town tries to keep the train coming through

  • In the face of present and growing missile threats, it is imperative that sensible members of the Democratic caucus do what they have done in droves on Gitmo: Ignore their leadership and cross the aisle, this time to join Republicans in defending America, before it's too late.

    CENTERFORSECURITYPOLICY: Missile defense misjudgment

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