题目内容

CREATETABLEcustomer(cidBIGINTNOTNULLPRIMARYKEY,infoXML)HowmanynameswillbereturnedforthisXQuery?（）

A. 0
B. 1
C. 2
D. 3

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Suspending an application monitor with the cluster running will have what effect on the application？（）

A
B
C
D

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Giventhefollowingtwotables: TAB1R1 AAABBCCDETAB2R2 AABBCCD Whichofthefollowingqueriesreturnsthefollowingresultset?RETVALE（）

A. SELECTr1ASretvalFROMtab1INTERSECTSELECTr2ASretvalFROMtab2
B. SELECTr1ASretvalFROMtab1EXCEPTSELECTr2ASretvalFROMtab2
C. SELECTDISTINCTr1ASretvalFROMtab1,tab2WHEREr1<>r2
D. SELECTr1ASretvalFROMtab1UNIONSELECTr2ASretvalFROMtab2

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WhendefiningareferentialconstraintbetweentheparenttableT2andthedependenttableT1,whichofthefollowingistrue?（）

A. ThelistofcolumnnamesintheFOREIGNKEYclausecanbeasubsetofthelistofcolumnnamesintheprimarykeyofT2oraUNIQUEconstraintthatexistsonT2.
B. ThelistofcolumnnamesintheFOREIGNKEYclausecanbeasubsetofthelistofcolumnnamesintheprimarykeyofT1oraUNIQUEconstraintthatexistsonT1.
C. ThelistofcolumnnamesintheFOREIGNKEYclausemustbeidenticaltothelistofcolumnnamesintheprimarykeyofT2oraUNIQUEconstraintthatexistsonT2.
D. ThelistofcolumnnamesintheFOREIGNKEYclausemustbeidenticaltothelistofcolumnnamesintheprimarykeyofT1oraUNIQUEconstraintthatexistsonT1.

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生意人指的是（）

A. 企业家
B. 售货员
C. 商贩

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CREATETABLEcustomer(cidBIGINTNOTNULLPRIMARYKEY,infoXML)HowmanynameswillbereturnedforthisXQuery?（）

A. 0 B. 1 C. 2 D. 3

Suspending an application monitor with the cluster running will have what effect on the application？（）

Giventhefollowingtwotables: TAB1R1 AAABBCCDETAB2R2 AABBCCD Whichofthefollowingqueriesreturnsthefollowingresultset?RETVALE（）

WhendefiningareferentialconstraintbetweentheparenttableT2andthedependenttableT1,whichofthefollowingistrue?（）

生意人指的是（）

A. 0
B. 1
C. 2
D. 3