4、FULL OUTER JOIN（全外连接）：返回左表和右表中所有行的组合。如果左表中的行在右表没有匹配，则右表中的列为NULL，反之亦然。不同类型的JOIN用于实现不同的数据表连接需求，有助于实现复杂的查询。The JOIN types in MySQL primarily include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN,...
MySQL CROSS JOIN, also known as a cartesian join, retrieves all combinations of rows from each table. In this type of JOIN, the result set is returned by multiplying each row of table A with all rows in table B if no additional condition is introduced. When you might need that type of...
- 右交Right Outer Join (Right Join),返回右表的所有项,如果没有匹配,左边就是NULL: SELECT*FROMRegularBeveragesRIGHTJOINCalorieFreeBeveragesONRegularBeverages.Code=CalorieFreeBeverages.Code;+---+---+---+---+|Name|Code|Name|Code|+---+---+---+---+|Coca-Cola|COCACOLA|Diet Coca-Cola|COCAC...
AJOINis a means for combining columns from one (self-join) or more tables by using values common to each. ANSI-standard SQL specifies five types ofJOIN:INNER,LEFT OUTER,RIGHT OUTER,FULL OUTERandCROSS. 翻译过来就是,“连接可以根据一张(自连接)或多张表中的共同值将这些表的列数据合并为一个新...
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The physical execution of various joins can use many different optimizations and therefore cannot be reliably predicted. Columns used in a join condition are not required to have the same name or be the same data type. However, if the data types are not identical, they must be compatible, ...
There are different types of joins available in SQL: INNER JOIN: returns rows when there is a match in both tables. LEFT JOIN: returns all rows from the left table, even if there are no matches in the right table. RIGHT JOIN: returns all rows from the right table, even if there are...
Types of joins EQL supports the following types of joins: INNER JOIN:INNER JOINjoins records on the left and right sides, then filters the result records by the join condition. That means that only rows for which the join condition isTRUEare included. If you do not specify the join type,...
Join Types Join TypesAn inner join (sometimes called a simple join) returns only those rows that satisfy the join condition. An outer join extends the result of a simple join. An outer join returns all rows that satisfy the join condition and also returns some or all of those rows from...