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下列有关运算符重载的叙述中，正确的是A．运算符重载是多态性的一种表现B．C++中可以通过运算符重载

下列有关运算符重载的叙述中，正确的是

A．运算符重载是多态性的一种表现

B．C++中可以通过运算符重载创造新的运算符

C．C++中所有运算符都可以作为非成员函数重载

D．重载运算符时可以改变其结合性

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更多“下列有关运算符重载的叙述中，正确的是A．运算符重载是多态性的…”相关的问题

第1题

Youexecutedthefollowingquery：SELECToperation，undo_sql，table_nameFROMflashback_transaction_query；Whichstatementiscorrectregardingthequeryoutput？（）

A．Itwouldreturninformationregardingonlythelastcommittedtransaction.

B．Itwouldreturnonlytheactivetransactionsinalltheundosegmentsinthedatabase.

C．Itwouldreturnonlythecommittedtransactionsinalltheundosegmentsinthedatabase.

D．Itwouldreturnbothactiveandcommittedtransactionsinalltheundosegmentsinthedatabase.

E．Itwouldreturninformationregardingthetransactionsthatbeganandwerecommittedinthelast30minutes.

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第2题

Youexecutedthefollowingquery：SELECToperation，undo_sql，table_nameFROMflashback_transaction_query；Whichstatementiscorrectregardingthequeryoutput？（）

A．Itwouldreturninformationregardingonlythelastcommittedtransaction.

B．Itwouldreturnonlytheactivetransactionsinalltheundosegmentsinthedatabase.

C．Itwouldreturnonlythecommittedtransactionsinalltheundosegmentsinthedatabase.

D．Itwouldreturnbothactiveandcommittedtransactionsinalltheundosegmentsinthedatabase.

E．Itwouldreturninformationregardingthetransactionsthatbeganandwerecommittedinthelast30minutes.

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第3题

At5：30PM，adatabaseadministrator，William，is

informedthatanimportantrecordofemployeenoE0025ismissingfromtheSCOTT.EMPLOYEEtable.At4：30P.M，thetablecontainedtherecordofemployeenoE0025.WilliamissuesthefollowingcommandtofindtheSQLstatementsthatareusedtoundothedeletion：

SELECToperation，undo_sql，logon_user

FROMFLASHBACK_TRANSACTION_QUERYWHERExid=

HEXTORAW（’0100043E23456’）；

where’0100043E23456’isthetransactionIDofthetransactionthatdeletedtherow.Beforeissuingtheabovestatement，whichtaskdidWilliamperformtoidentifythetransactionIDofthetransactionthatdeletedtherow？（）

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第4题

The()writestheFlashbackDatabaselogsintheflashrecoveryarea.

A.FLSH

B.FLDB

C.RVWR

D.RVRW

E.FBDA

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第5题

FlashbackDatabasereliesonwhichtechnologiestorecovertoapointintime?()

A.FlashbackDataArchive

B.Flashbacklogsintheflashrecoveryarea

C.FlashbUndotablespace

D.RMANcommandline

E.Noneoftheabove

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第6题

YouaremanaginganOracleDatabase11gdatabase.Thedatabaseisopen,andyouplantoperformRecoveryManager(RMAN)backups.Whichthreestatementsaretrueaboutthesebackups()

A.Thebackupswouldbeconsistent.

B.Thebackupswouldbeinconsistent.

C.ThebackupswouldbepossibleonlyifthedatabaseisrunninginARCHIVELOGmode.

D.ThebackupswouldbepossibleonlyifthedatabaseisrunninginNOARCHIVELOGmode.

E.Thebackupsneedtoberestoredandthedatabasehastoberecoveredincaseofamediafailure

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第7题

Bymistake,youranthebatchjob(forupdatingtheBILL_DETAILStable)twice.Youarenotsurewhichrowsin

Bymistake，youranthebatchjob（forupdatingtheBILL_DETAILStable）twice.YouarenotsurewhichrowsintheBILL_DETAILStablewereaffected.Youneedtoidentify：a）alistofchangesmadealongwiththetransactionidentifierofeachchangeb）thenecessarySQLstatementstoundotheerroneouschangesWhichoptionwouldyouchoose？（）

A.RMANonly

B.FlashbackTableonly

C.FlashbackVersionsQueryonly

D.FlashbackDatabaseandFlashbackTransactionQuery

E.FlashbackVersionsQueryandFlashbackTransactionQuery

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第8题

Examine the statement: Create synonym emp for hr. employees; What happens when you issue the statement? ()

A. An error is generated.

B. You will have two identical tables in the HR schema with different names.

C. You create a table called employees in the HR schema based on you EMP table.

D. You create an alternative name for the employees table in the HR schema in your own schema.

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第9题

WhichmethodcouldbeutilizedtoidentifybothDMLoperationsandtheSQLstatementsneededtoundothoseoperationsforaspecificschemaowner?()

A.A

B.B

C.C

D.D

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第10题

Which statement accomplish this? ()

A. CREATE TABLE orders ( order_id NUMBER (10), customer_id NUMBER (8), order_status VARCHAR2 (10), date_ordered DATE = SYSDATE);

B. CREATE TABLE orders ( order_id NUMBER (10), customer_id NUMBER (8), order_status VARCHAR2 (10), date_ordered DATE DEFAULT SYSDATE);

C. CREATE OR REPLACE TABLE orders ( order_id NUMBER (10), customer_id NUMBER (8), order_status VARCHAR2 (10), date_ordered DATE DEFAULT SYSDATE);

D. CREATE OR REPLACE TABLE orders ( order_id NUMBER (10), customer_id NUMBER (8), order_status NUMBER (10), date_ordered DATE = SYSDATE);

E. CREATE TABLE orders ( order_id NUMBER (10), customer_id NUMBER (8), order_status NUMBER (10), date_ordered DATE = SYSDATE);

F. CREATE TABLE orders ( order_id NUMBER (10), customer_id NUMBER (8), order_status NUMBER (10), date_ordered DATE DEFAULT SYSDATE);

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