3、
(1）SELECTFROM S WHERE A=10;
(2)SELECT A,B FROM S
(3)SELECTFROM S INNER JOIN T ON S.C=T.C AND S.D=T.D
(4)SELECTFROM S INNER JOIN T ON S.C=T.C
(5)SELECTFROM S INNER JOIN T ON S.A<S.E
(6)SELECT*FROM S,T WHERE S.C=T.C AND T.D=S.D
4、S表：S（SNO，SNAME，STATUS，CITY）；
建表：CREATETABLES（SnoC（2）UNIQUE，SnameC（6），StatusC（2），CityC（4））；
P表：P（PNO，PNAME，COLOR，WEIGHT）；
建表：CREATETABLEP（PnoC（2）UNIQUE，PnameC（6），COLORC（2），WEIGHTINT）；
J表：J（JNO，JNAME，CITY）；
建表：CREATETABLEJ（JnoC（2）UNlQUE，JNAMEC（8），CITYC（4））
sPJ表：sPJ（sNo，PNo，JNo，QTY）；
建表：SPJ（SNO，PNO，JNO，QTY）CREATETABLESPJ（SnoC（2），PnoC（2），JNOC（2），QTYINT））
查询：
(1）求供应工程 Jl 零件的供应商号码 SNO ;
SELECT DIST SNO FROM SPJ WHERE JNO=‘J1’
（2）求供应工程 Jl 零件 Pl 的供应商号码 SNO ;
SELECT DIST SNO FROM SPJ WHERE JNO=‘J1’ AND PNO=‘P1’
（3）求供应工程 Jl 零件为红色的供应商号码 SNO ;
SELECT SNO FROM SPJ,P WHERE JNO=‘J1’ AND SPJ.PNO=P.PNO AND COLOR=‘红’
（4）求没有使用天津供应商生产的红色零件的工程号JNO；
SELECT DIST JNO FROM SPJ WHERE JNO NOT IN(SELECT JNO FROM SPJ,P,S WHERE S.CITY=‘天津’ AND COLOR=‘红’ AND S.SNO=SPJ.SNO AND P.PNO=SPJ.PNO)
(5)求至少供应商S1所供应的全部零件的工程号JNO;
1、查询S1供应商所提供零件号
SELECT DIST PNO FROM SPJ WHERE SNO=‘S1’
结果：（P1,P2）
2、查询哪个工程既用P1又用P2
SELECT JNO FROM SPJ WHERE PNO=‘P1’ AND JNO IN (SELECT JNO FROM SPJ WHERE PNO=‘P2’)
5、
（1）SELECT SNAME,CITY FROM S
(2)SELECT PNAME,COLOR WEIGHT FROM P
(3)SELECT DIST JNO FROM SPJ WHERE SNO=‘S1’
(4)SELECT PNAME,QTY FROM SPJ,P WHERE P.PNO=SPJ.PNO AND SPJ.JNO=‘J2’
(5)SELECT PNO FROM SPJ,S WHERE S.SNO=SPJ.SNO AND CITY=‘上海’
(6)SELECT JNAME FROM SPJ,S,J WHERE S.SNO=SPJ.SNO AND S.CITY=‘上海’ AND J.JNO=SPJ.JNO
(7)SELECT DIST JNO FROM SPJ,S WHERE S.SNO=SPJ.SNO AND S.CITY<>‘天津’
(8)UPDATE P SET COLOR=‘蓝’ WHERE COLOR=‘红’
(9)UPDATE SPJ SET SNO=‘S3’ WHERE SNO=‘S5’ AND JNO=‘J4’ AND PNO=‘P6’
(10)DELETE FROM S WHERE SNO=’S2’
DELETE FROM SPJ WHERE SNO=’S2’
(11)INSERT INTO SPJ VALUES（‘S2’，‘J6’，‘P4’，200）
9、
(1)SELECT DIST PNO,QTY FROM VSP
(2)SELECT DIST * FROM VSP WHERE SNO=‘S1’