Connecting the outer connecting join and left join cross-connect difference a, b cross joni union joint inner MySQL- - Code World

Connecting the outer connecting join and left join cross-connect difference a, b cross joni union joint inner MySQL-

Others 2020-03-19 08:37:22 views: null

https://blog.csdn.net/johnhan9/article/details/88686288
https://blog.csdn.net/zhwyj1019/article/details/77615807
difference
within the connector (inner join): Remove the two match the data table, not match does not retain
the outer connector (outer join): remove connections table to match the data will not match the reservation, which is NULL
cross-connect: Cartesian product cross join

https://www.runoob.com/mysql/mysql-union-operation.html
Joint: Union
MySQL Union keyword for combining two or more results to select a set, the default may be used to re distinct All
Union all

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Origin www.cnblogs.com/djwhome/p/12521827.html

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