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SELECT SNO,SNAME FROMSWHERE SNAME=’王%’ SELECT SNO,SNAME FROM S WHERE SNAME=’王_’ SELECT SNO,SNAMEFROMS WHERE SNAME LIKE ’王%’ SELECT SNO,SNAME FROM S WHERE SNAME LIKE ’王_’
SELECT SNAME FROM S,SC,C WHERE S.SNO=SSNO AND SCNO=CNO AND CNAME=′DB′ SELECT SNAME FROM S WHERE SNO IN(SELECT SNO FROM SC,C WHERE SCNO=CNO AND CNAME=′DB′) SELECT SNAME FROM S WHERE SNO IN(SELECT SNO FROM SC WHERE CNO IN(SELECT CNO FROM C WHERE CNAME=′DB′) ) SELECT SNAME FROM S,C WHERE CNAME=′DB′
SELECT SNO,SNAME FROM S WHERE SNAME=′王%′ SELECT SNO,SNAME FROM S WHERE SNAME=′王_′ SELECT SNO,SNAME FROM S WHERE SNAME LIKE′王%′ SELECT SNO,SNAME FROM S WHERE SNAME LIKE′王_′
SELECT SNO FROM SC WHERE CNO=′DB′AND GRADE DETWEEN 60 AND 90 SELECT SNO FROM SC WHERE CNO=′DB′OR GRADE BETWEEN 60 AND 90 SELECT SNO FROM SC WHERE CNO=′DB′AND GRADE>=60 AND 90 SELECT SNO FROM SC WHERE CNO=′DB′AND GRADE<=60 AND GRADE>=90
SELECT s. sname FROM s, sc WHERE c. cno=’C1’ SELECT s. sname FROM s, sc WHERE c. cno=’C1’AND s. sno=sc. sno SELECT s. sname FROM s, sc FOR c. cno=’C1’ SELECT s. sname FROM s, sc FOR c. cno=’C1’ AND s. sno=sc. sno
SELECT sno FROM sc WHERE grade=NULL SELECT sno FROM sc WHERE grade IS SELECT sno FROM sc WHERE grade IS NULL SELECT sno FROM sc WHERE grade=0
SELECT sno FROM sc WHERE grade=NULL SELECT sno FROM sc WHERE grade IS SELECT sno FROM sc WHERE grade IS NULL SELECT sno FROM sc WHERE grade=0
SELECT sno FROM sc WHERE sname=’王’ SELECT sno FROM sc WHERE sname IS LIKE ’王%’ SELECT sno FROM sc WHERE sname LIKE ’王%’ SELECT sno FROM sc WHERE sname LIKE ’王_’
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SELECT SNO FROMSC WHERE CNO=’DB’ AND GRADE BETWEEN 60 AND 90 SELECT SNO FROM SC WHERE CNO=’DB’ OR GRADE BETWEEN 60 AND 90 SELECT SNO FROM SC WHERE CNO=’DB’ AND GRADE>=60 AND 90 SELECTSNO FROM SCWHERECNO=’DB’ AND GRADE<=60 AND GRADE>=90
SELECT sno FROM sc WHERE sname=’王’ SELECT sno FROM sc WHERE sname IS LIKE ’王%’ SELECT sno FROM sc WHERE sname LIKE ’王%’ SELECT sno FROM sc WHERE sname LIKE ’王_’
SELECT SNO FROM SC WHERE CNO=′DB′AND GRADE DETWEEN 60 AND 90 SELECT SNO FROM SC WHERE CNO=′DB′OR GRADE BETWEEN 60 AND 90 SELECT SNO FROM SC WHERE CNO=′DB′AND GRADE>=60 AND 90 SELECT SNO FROM SC WHERE CNO=′DB′AND GRADE<=60 AND GRADE>=90
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SELECT SNO,SNAME FROM S WHERE SNAME=′王%′ SELECT SNO,SNAME FROM S WHERE SNAME=′王_′ SELECT SNO,SNAME FROM S WHERE SNAME LIKE′王%′ SELECT SNO,SNAME FROM S WHERE SNAME LIKE′王_′
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SELECT s.sname FROM s,sc WHERE c.cno=′C1′ SELECT s.sname FROM s,sc WHERE c.cno=′C1′AND s.sno=sc.sno SELECT s.sname FROM s,sc FOR c.cno=′C1′ SELECT s.sname FROM s,sc FOR c.cno=′C1′AND s.sno=sc.sno
SELECT SNAME FROM S,SC,C WHERE SNO=SSNO AND SCNO=CNO AND CNAME=′DB′ SELECT SNAME FROM S WHERE SNO IN(SELECT SNO FROM SC,C WHERE SCNO=CNO AND CNAME=′DB′) SELECT SNAME FROM S WHERE SNO IN(SELECT SNO FROM SC WHERE CNO IN(SELECT CNO FROM C WHERE CNAME=′DB′) ) SELECT SNAME FROM S,C WHERE CNAME=′DB′
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