單項(xiàng)選擇題

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

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單項(xiàng)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

多項(xiàng)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

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Which statement is true regarding the INTERSECT operator?（）

你可能感興趣的試題

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?（）

When does a transaction complete?（）

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