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右外部ジョイン
右外部結合
A left outer join preserves every row in the left-hand table, and a right outer join preserves every row in the right-hand table.
However, suppose you want to include all Customers- even those who have not yet placed any orders. To accomplish this, you must change the join type from an inner join to what is called a left outer join. A left outer join returns all of the rows from the table on the left side of the relationship and only those that match from the table on the right. A right outer join returns all of the rows on the right and only those that match on the left.
In an equijoin, key values from the two tables must a full outer join, key values are matched and nulls are created in the resulting table for key values that cannot be matched. A left or a right outer join retains all rows in the specified table.
In a left or right outer join, all rows are preserved for one of the tables, and for the other table nulls are returned for rows that do not satisfy the join condition.
For example, in a right outer join the right side is preserved and the left side is null-supplying.
たとえば右外部ジョインでは、右側が保護され、左側に NULL が入力されます。
Right outer join operator
右外部ジョイン演算子
Right outer join (=+)-A right join retrieves all rows from the topic on the right and any rows from the topic on the left that have matching values in the join column.
To work around this, you can use syntax such Left Inner Join, Right Outer Join instead of using the plus (+) symbol. You can modify this query to include Oracle-specific syntax, however, this causes the Query Designer to throw an error. You may ignore the error and proceed with the query. The query executes and a message box appears indicating any errors from the execution.
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