Which three statements are true about performing Data Manipulation Language (DML) operations on a view with no INSTEAD OF triggers defined? (Choose three.)
A.
Views cannot be used to query rows from an underlying table if the table has a PRIMARY KEY and the PRIMARY KEY columns are not referenced in the defining query of the view.
B.
The WITH CHECK clause has no effect when deleting rows from the underlying table through the view.
C.
Delete statements can always be done on a table through a view.
D.
Views cannot be used to add or modify rows in an underlying table if the defining query of the view contains the DISTINCT keyword.
E.
Views cannot be used to add rows to an underlying table if the table has columns with NOT NULL constraints lacking default values which are not referenced in the defining query of the view.
F.
Insert statements can always be done on a table through a view.
I agree BDE
views restrictions DML, :
if contains set distinct operations, group by ,no delete, update or insert
if defined with check option no insert or update if view cannot select the row from the base table.
if not null value not have default , no can insert values.
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Oracle2020
3 months, 1 week agoivanadj
1 year, 4 months ago