Which of the following is true of an index used to support a UNIQUE constraint?() A.It must have the UNIQUE attribute.B.It cannot be created explicitly by the user.C.It must have the UNIQUE and CLUSTER attributes.D.It must have the UNIQUE WHERE NOT NULL attribute.
Which of the following is true of an index used to support a UNIQUE constraint?()
A.It must have the UNIQUE attribute.
B.It cannot be created explicitly by the user.
C.It must have the UNIQUE and CLUSTER attributes.
D.It must have the UNIQUE WHERE NOT NULL attribute.
相关考题：
You’re going to have a quiz ( )by another two in the ( )month. A. followed,followedB. followed,followingC. following,followedD. following,following
Giventhetwosecurityconstraintsinadeploymentsecurity-constraint102.!--acorrecturl-patternandhttp-methodgoeshere--103.auth-constraintrole-nameSALES/role-name/auth-.auth-constraint104.role-nameSALES/role-name105./auth-constraint106./security-constraint107.security-constraint108.!--acorrecturl-patternandhttp-methodgoeshere--109.!--Insertanauth-constrainthere--110./security-constraintIfthetwosecurityconstraintshavethesameurl-patternandhttp-methodwhichtwo insertedindependentlyatline109，willallowuserswithrolenamesofeitherSALESorMARKETINGtoaccessthisresource？（）
You have to be patient if you want to sustain your position.A:maintainB:establishC:acquireD:support
a=[1,1,1,2,2,2,3,3,3] b=a.count（3) c=a.index（3) 则b和c的值分别是_____.A．3,6B．3,7C．True,6D．1,7