你可能感兴趣的试题
σF(S1∩S2)=σF(S1)∩σF(S2) πP(S1∩S2)=πP(S1)∪πP(S2) σF(S1∪S2)=σF(S1)∪σF(S2) πP(S1∪S2)=πP(S1)∪πP(S2)
if(*s1==*s2)
puts("they are Equal"); if(!strcmp(s1,s2))
puts("they are Equal"); if(s1==s2)
Puts("they are Equal"); if(strcmp(s1,s2) )
puts("they are Equal");
GOTOANPLAY("S1"); THIS.GOTOANDSTOP("S1"); THIS.GOTOADPLAY("S1") THIS.GOTOANDPLAY("S1");
S1 ∩(S2∩S3)=(S1∩S2)∩ S3 πA(S1∩S2)=πA(S1)∩ πA(S2) δF(S1∩S2)=δF(S1)∩δF(S2) πA(S1∪S2)=πA(S1)∪πA(S2)
if(strcmp(s1,s2)==0) puts(s1); if(strcmp(s1,s2)!=0) puts(s2); if(strcmp(s1,s2)==1) puts(s1); if(strcmp(s1,s2)!=0) puts(s1);
if(strcmp(s1,s2)<0) if(s1>s2) if(strcmp(s2,s1)<0) if(strcmp(s1,s2))
if(strcmp(s1,s2)=0)puts(s1); if(strcmp(s1,s2)!=0)puts(s2); if(strcmp(s1,s2)==1)puts(s1); if(strcmp(s1,s2)==0)puts(s1);
if(*s1==*s2) if(!strcmp(s1,s2)) puts("they are Equal"); puts("they are Equal"); if(s1==s2) if(strcmp(s1,s2)) Puts("they are Equal"); puts("they are Equal");
if(strcmp(s1,s2)==0) puts(s1); if(strcmp(s1,s2)!=0) puts(s2); if(strcmp(s1,s2)==1) puts(s1,); if(strcmp(s1,s2)!=0)puts(s1);
gotoAndPlay(“S1”) this.GotoAndPlay(“S1”) this.gotoAndPlay(“S1”) this.gotoAndPlay(“S1”)
if(*s1==*s2) puts("they are Equal"); if(!strcmp(s1,s2)) puts("they are Equal"); if(s1==s2) Puts("they are Equal"); if(strcmp(s1,s2)) puts("they are Equal");
σF(S1∩S2)=σF(S1)∩σF(S2) πp(S1 ∩S2)=πp(S1)∩ πp(S2) σF(S1∪S2)=σF(S1)∪σF(S2) πp(S1∪S2)=πp(S1)∪πp(S2)
GOTOANPLAY("S1"); THIS.GOTOANDSTOP("S1"); THIS.GOTOADPLAY("S1") THIS.GOTOANDPLAY("S1");
if(s1==s2) if(s1=s2) if(strcmp(s1,s2)) if(strcmp(s1,s2)==0)