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s-1是()。

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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)  

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