Examples with "create an outer join" and their translation in Japans
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You can add the rows of two results sets without adding more columns (which is result of a simple join of local results). Traditionally to add rows, you perform a SQL operation. However, you can simulate a union without having a do this, you add a dummy non-matching column and create an outer join of the results sets.
In contrast, to select all departments (even if some have no employees assigned to them) or all employees (even if some are not assigned to a department), you can use a LEFT JOIN or RIGHT JOIN operation to create an outer join.
これに対して、所属する社員が 1 人もいない部署も含めすべての部署を選択したり、どの部署にも所属していない社員も含め社員全員を選択するには、 LEFT JOIN または RIGHT JOIN 操作を使用して外部結合を作成します。
In Oracle8i, you create an outer join in SQL using the join condition variable (+)
The Joiner operator joins multiple row sets from different sources with different cardinalities, and produces a single output row set. You can use the Joiner operator to create inner joins, outer joins, equijoins, and non- equijoins. You can also create self joins by using a Filter operator as described in Adding Self Joins in a Mapping.
In the Transact-SQL dialect, you create outer joins by supplying a comma-separated list of tables in the FROM clause, and using the special operators = or = in the WHERE clause.
Transact-SQL ダイアレクトでは、FROM 句内にカンマで区切られたテーブルのリストを指定し、WHERE 句内で特殊な演算子 = or = を使用して外部ジョインを作成します。
This example is a left outer join. Rows from table A are included in the joined result even though no rows from table B match them. To create a full outer join in Oracle8i, you must use multiple SQL statements.
Restrictions include: You cannot use the (+) notation to create FULL OUTER JOIN; you can only create LEFT OUTER JOIN and RIGHT OUTER JOIN.
制限事項は次のとおりです。 FULL OUTER JOIN を作成するために (+) 表記を使用することはできません。
Use a LEFT JOIN operation to create a left outer join. Left outer joins include all of the records from the first (left) of two tables, even if there are no matching values for records in the second (right) table.
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