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Auxiliary node that represents a subquery in a particular SQL statement.
A subquery can be any of the following operations:
MERGE
INSERT
SELECT
UPDATE
DELETE
SELECT with FOR UPDATE OF
UPDATE WHERE CURRENT OF CURSOR
DELETE WHERE CURRENT OF CURSOR
TRUNCATE
Table expression
Correlated subselect or full select
Non-correlated subselect or fullselect
EXCEPT
EXCEPT ALL
EXCEPT
EXCEPT ALL
UNION
UNION ALL
Notes:
The query block node is the root of a subtree and represents the whole subquery.
QBn denotes a query block node,where n represents the query block number.
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