设有一个spj数据库包括sjp 设有一个spj数据库

设有一个spj数据库包括sjp

1. 创建表 以S表为例,P表、J表、SPJ表同理的. create table s (sno char(5), sname char(20), status char(8), city char(15)) 向表内插入记录,以第一条为例,其它同理. insert into s values('s1','精益','20','天津') 2. 查询 1)select sname,city from s 2)select pname,color,weight from p 3)select jno from spj where sno='s1' 4)select pname,qty from p,spj where p.pno=spj.pno and jno='j2' 5)select pno from s,spj where s.sno=spj.sno and city='上海' 6)select jno .

SQL语句:(如果这J1和P1是JNAME和PNAME) (1)SELECT S.SNO FROM S,SPJ WHERE S.SNO=SPJ.SNO AND SPJ.JNAME='J1' ; (2)SELECT S.SNO FROM S,SPJ WHERE S.SNO=SPJ.SNO AND SPJ.JNAME='J1' AND P.PNAME='P1'; (3)SELECT S.SNO FROM S,SPJ,P WHERE S.SNO=SPJ.SNO AND SJP.PNO=P.PNO AND SPJ.JNAME='J1' AND P.COLOR='红色'; 如果这J1和P1是JNO和PNO: (1)SELECT SNO FROM SPJ WHERE .

关系代数: 1)求供应工程J1零件的供应商号码SNO: πSno(σSno='J1'(SPJ)) 2)求供应工程J1零件P1的供应商号码SNO: πSno(σSno='J1'∧Pno='P1'(SPJ)) 3)求供应工程J1零件为红色的供应商号码SNO: πSno(σPno='P1'(σCOLOR='红' (P)∞SPJ)) 4)求没有使用天津供应商生产的红色零件的工程号JNO: πJno(SPJ)- πJNO(σcity='天津'∧Color='红' (S∞SPJ∞P) 5)求至少用了供应商S1所供应的全部零件的工程号JNO: πJno,Pno(SPJ)÷.

设有一个spj数据库

430).在Access数据库中,对数据表进行统计的是( C). A)、汇总查询 B)、操作查询 C)、选择查询 D)、删除查询 432).在Access数据库中,对数据表求列平均值的是(C ). A)、汇总查询 B)、操作查询 C)、选择查询 D)、追加查询 433).在Access数据库中,对数据表进行删除的是( B). A)、汇总查询 B)、操作查询 C)、选择查询 D)、SQL查询 435).在Access数据库中,从数据表找到符合特定准则的数据信息的是( C). A)、汇总查询 B)、操.

1. 下面哪些是Thread类的方法()A start() B run() C exit() D getPriority()答案:. checked exceptions: 通常是从一个可以恢复的程序中抛出来的,并且最好能够从这.

select distinct Sn from S,C,SC where S.S#=SC.S# and C.C#=SC.C# and Cn in(select Cn from S,C,SC where S.S#=SC.S# and C.C#=SC.C# and S.S#='s5')

设有一个spj

SQL语句:(如果这J1和P1是JNAME和PNAME) (1)SELECT S.SNO FROM S,SPJ WHERE S.SNO=SPJ.SNO AND SPJ.JNAME='J1' ; (2)SELECT S.SNO FROM S,SPJ WHERE S.SNO=SPJ.SNO AND SPJ.JNAME='J1' AND P.PNAME='P1'; (3)SELECT S.SNO FROM S,SPJ,P WHERE S.SNO=SPJ.SNO AND SJP.PNO=P.PNO AND SPJ.JNAME='J1' AND P.COLOR='红色'; 如果这J1和P1是JNO和PNO: (1)SELECT SNO FROM SPJ WHERE .

1. 创建表 以s表为例,p表、j表、spj表同理的. create table s (sno char(5), sname char(20), status char(8), city char(15)) 向表内插入记录,以第一条为例,其它同理. insert into s values('s1','精益','20','天津') 2. 查询 1)select sname,city from s 2)select pname,color,weight from p 3)select jno from spj where sno='s1' 4)select pname,qty from p,spj where p.pno=spj.pno and jno='j2' 5)select pno from s,spj where s.sno=spj.sno and city='上海' 6)select jno from.

1. ∏sno(δjno='j1'(spj)) 2. ∏sno(δpno='p1'(δjno='j1'(spj))) 3. ∏sno(δjno='j1'(spj)∞δcolor='红'(p)) 4. ∏jno(δcity!='天津'(s)∞spj∞δcolor!='红'(p)) 5. ∏jno,pno(spj)÷∏pno(δsno='s1'迹氦管教攮寄归犀害篓(spj)) 没有找到合适的符号,所以连接用的是∞.

用sql创建spj数据库

1. 创建表 以S表为例,P表、J表、SPJ表同理的. create table s (sno char(5), sname char(20), status char(8), city char(15)) 向表内插入记录,以第一条为例,其它同理. insert into s values('s1','精益','20','天津') 2. 查询 1)select sname,city from s 2)select pname,color,weight from p 3)select jno from spj where sno='s1' 4)select pname,qty from p,spj where p.pno=spj.pno and jno='j2' 5)select pno from s,spj where s.sno=spj.sno and city='上海' 6)select jno .

建数据库文件 create database mydb on primary ( name = mydb_data1, filename = 'd:\sql data\mydb_data1.mdf', size = 1, maxsize = unlimited, filegrowth = 10% ), filegroup data2 ( name = mydb_data2, filename = 'd:\sql data\mydb_data2.ndf', size = 2, maxsize = 100, filegrowth = 1 ), filegroup data3 ( name = mydb_data3, filename = 'd:\sql data\mydb_data3.ndf', size = 3, maxsize = 50, filegrowth = 500kb ) log on ( name = 'mydb_log1', filename = 'd:\sql data\.

CREATE TABLE TEACHER ( TID CHAR(10) primary key, TNAME VARCHAR(20), TDEPT VARCHAR(30), TJNAME CHAR(6) ) insert into TEACHER values('110','黄嘉欣','管理学系','教授') insert into TEACHER values('111'. --3. CREATE VIEW QL as SELECT TNAME,CNAME,thour FROM COURSE1 C1,TEACHER TR ,tcourse TE WHERE C1.CNO=TE.CNO AND TR.TID = TE.TID AND TE.tyear=2014 SELECT * FROM QL我用的数据库是SQL2008 .

spj数据库

1. 创建表 以S表为例,P表、J表、SPJ表同理的. create table s (sno char(5), sname char(20), status char(8), city char(15)) 向表内插入记录,以第一条为例,其它同理. insert into s values('s1','精益','20','天津') 2. 查询 1)select sname,city from s 2)select pname,color,weight from p 3)select jno from spj where sno='s1' 4)select pname,qty from p,spj where p.pno=spj.pno and jno='j2' 5)select pno from s,spj where s.sno=spj.sno and city='上海' 6)select jno .

SQL语句:(如果这J1和P1是JNAME和PNAME) (1)SELECT S.SNO FROM S,SPJ WHERE S.SNO=SPJ.SNO AND SPJ.JNAME='J1' ; (2)SELECT S.SNO FROM S,SPJ WHERE S.SNO=SPJ.SNO AND SPJ.JNAME='J1' AND P.PNAME='P1'; (3)SELECT S.SNO FROM S,SPJ,P WHERE S.SNO=SPJ.SNO AND SJP.PNO=P.PNO AND SPJ.JNAME='J1' AND P.COLOR='红色'; 如果这J1和P1是JNO和PNO: (1)SELECT SNO FROM SPJ WHERE .

1. ∏sno(δjno='j1'(spj)) 2. ∏sno(δpno='p1'(δjno='j1'(spj))) 3. ∏sno(δjno='j1'(spj)∞δcolor='红'(p)) 4. ∏jno(δcity!='天津'(s)∞spj∞δcolor!='红'(p)) 5. ∏jno,pno(spj)÷∏pno(δsno='s1'(spj)) 没有找到合适的符号,所以连接用的是∞.