多项选择题

Which two statements are true regarding the USING and ON clauses in table joins?（）

A.Both USING and ON clauses can be used for equijoins and nonequijoins
B.Amaximum of one pair of columns can be joined between two tables using the ON clause
C.The ON clause can be used to join tables on columns that have different names but compatible data types
D.The WHERE clause can be used to apply additional conditions in SELECT statements containing the ON or the USING clause

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单项选择题

Which statement is true regarding the INTERSECT operator?（）

A.It ignores NULL values
B.Reversing the order of the intersected tables alters the result
C.The names of columns in all SELECT statements must be identical
D.The number of columns and data types must be identical for all SELECT statements in the query

单项选择题

The ORDERS table belongs to the user OE. OE has granted the SELECT privilege on the ORDERS table to the user HR.Which statement would create a synonym ORD so that HR can execute the following query successfully?（）

A.CREATE SYNONYM ord FOR orders; This command is issued by OE
B.CREATE PUBLIC SYNONYM ord FOR orders; This command is issued by OE
C.CREATE SYNONYM ord FOR oe.orders; This command is issued by the database administrator
D.CREATE PUBLIC SYNONYM ord FOR oe.orders; This command is issued by the database administrator

多项选择题

When does a transaction complete?（）

A.when a DELETE statement is executed
B.when a ROLLBACK command is executed
C.when a PL/SQL anonymous block is executed
D.when a data definition language (DDL) statement is executed
E.when a TRUNCATE statement is executed after the pending transact ion