單項選擇題

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

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多項選擇題

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

單項選擇題

Which statement is true regarding the COALESCE function?（）

A.It can have a maximum of five expressions in a list
B.It returns the highest NOT NULL value in the list for all rows
C.It requires that all expressions in the list must be of the same data type
D.It requires that at least one of the expressions in the list must have a NOT NULL value