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程序中只有a='/';语句不正确 b='/xbc';语句不正确 d="/0127";语句不正确 a='/';和 c='/0xab';语句都不正确
A=1andB=4 A=1&&B=4 not(A<;>;1)andnot(B<;>;4) not(A<;>;1)&¬(B<;>;4)
('1031','曾华',男,23) ('1031','曾华',NULL,NULL) (NULL,'曾华','男','23') ('1031',NULL,'男',23)
程序中只有a=''/'';语句不正确 b=''/xbc'';语句不正确 d="/0127";语句不正确 a=''/'';和 c=''/0xab'';语句都不正确
IN(M, LIKE('M','F') CHECK('M','F') CHECK(性别IN('M','F'))
SELECT S#,SNAME FROM S WHERE S# = (SELECT SS# FROM SC WHERE C# = 'C2' ) SELECT S#,SNAME FROM S,SCWHERE S# = SS# AND C# = 'C2' SELECT S#,SNAME FROM S,SC WHERE S# = SS# AND C# = 'C2' ORDER BY S# SELECT S#,SNAME FROM S WHERE S# IN (SELECT SS# FROM SC WHERE C# ='C2' )
SELECT*FROMCUSTOMERWHEREPRICELIKE'%500%' SELECT*FROMCUSTOMERWHEREPRICEBETWEEN500AND* SELECT*FROMCUSTOMERWHEREPRICE>500 SELECT *FROMCUSTOMERWHEREPRICE>=500
break可以用于循环体内 break语句可以在for循环语句中出现多次 break语句可以在switch语句中出现多次 break语句可用于if条件判断语句内
OPEN(UNIT=3,FILE=ADAT,STATUS=NEW) OPEN(UNIT=3,FILE=ADAT,STATUS=OL OPEN(3,FILE='ADAT',STATUS='NEW') OPEN(D,FILE='ADAT',STATUS='OLD')
gets(; white((s[i++]=getchar())!='');s=/0; scanf("%s",; d0{scanf("%c",&;}while(s[i++]!='';s='/0';
3141512>>OK! 31415120K!>> 414150K!>> 31415>>OK!
gets(s); white((s[i++]=getchar())!='');s[i]=/0; scanf("%s",s); d0scanf("%c",&s[i]);while(s[i++]!='';s[i]='/0';
('201001','刘芳',女,'17') ('202345',NULL,'女',25) (NULL,'王名','男,'NULL) ('200746','黄祟',NULL,NULL)
EXEC P1 EXEC P1 DEFAULT,200,'XXX' EXEC P1 200 EXEC P1 'XXX'