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NUMBER( ) can be used in a view (subject to the above restrictions), but the view column corresponding to the expression involving NUMBER( ) can be referenced at most once in the query or outer view, and the view cannot participate as a NULL-supplying table in a left outer join or full outer join.
Outer or full outer join (+ = +)-An outer join combines the impact of a left and right join. An outer join retrieves all rows from both tables matching joined column values, if found, or retrieves nulls for non-matching values. Every row represented in both topics is displayed at least once.
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.
You can specify both full outer join and join conditions in the same joiner. However, if both conditions are specified for the same sources, the stronger join type is used for generating code. For example, if you specify
Do not specify a full outer join condition for versions earlier than Oracle 9i.
Oracle9iより前のリリースの場合は、完全外部結合条件を指定しないでください。
There are no fundamental changes to the way you write queries but there a two big new features: Outer joins are now correctly typed, returning an Option for one side (or both in case of a full outer join).
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.
The ANSI join syntax is generated only if you specify a full outer join condition in the joiner. Otherwise, the following Oracle proprietary join syntax is generated
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