子查询（一）创建表
建库建表，插入数据，写查询语句（按语义选择适当的查询方式，不要求一定用子查询）
create table CUSTOMERS
--客户表
(
cid varchar2(10) primary key, --客户编号
cname varchar2(10), --名称
city varchar2(20), --所在城市
discnt number(10,2) --折扣
)
insert into CUSTOMERS values ('c001','TipTop','Duluth',10.00)
insert into CUSTOMERS values ('c002','Basics','Dallas',12.00)
insert into CUSTOMERS values ('c003','Allied','Dallas',8.00)
insert into CUSTOMERS values ('c004','ACME','Duluth',8.00)
insert into CUSTOMERS values ('c006','ACME','Kyoto',0.00)
create table PRODUCTS --产品表
(
pid varchar2(10)primary key, --产品编号
pname varchar2(10), --名称
city varchar2(20), --产地
quantity varchar2(10), --库存量
price number(10,2) --单价
)
insert into PRODUCTS values ('p01','comb','Dallas','111400',0.50)
insert into PRODUCTS values ('p02','brush','Newark','203000',0.50)
insert into PRODUCTS values ('p03','razor','Duluth','150600',1.00)
insert into PRODUCTS values ('p04','pen','Duluth','125300',1.00)
insert into PRODUCTS values ('p05','pencil','Dallas','221400',1.00)
insert into PRODUCTS values ('p06','folder','Dallas','123100',2.00)
insert into PRODUCTS values ('p07','case','Newark','100500',1.00)
create table AGENTS
--代理商
(
aid varchar2(4) primary key, --编号
aname varchar2(10), --名称
city varchar2(10), --所在城市
percent number(10,4) --佣金百分比
)
insert into AGENTS values('a01','Smith','New York',6)
insert into AGENTS values('a02','Jones','Newark',6)
insert into AGENTS values('a03','Brown','Tokyo',7)
insert into AGENTS values('a04','Gray','New York',6)
insert into AGENTS values('a05','Otasi','Duluth',5)
insert into AGENTS values('a06','Smith','Dallas',5)
create table ORDERS --订单表
(
ordno varchar2(4), --订单号
cid varchar2(10), --客户编号
aid varchar2(4), --代理商编号
pid varchar2(10), --产品编号
qty number(5), --数量
dollars number(10,2) --总金额
)
insert
into
ORDERS values
(
'1011'
,
'c001'
,
'a01'
,
'p01'
,
1000
,
450.00
)
insert into ORDERS values('1012', 'c001','a01','p01',1000,450.00)
insert into ORDERS values('1019', 'c001','a02','p02',400,180.00)
insert into ORDERS values('1017', 'c001','a06','p03',600,540.00)
insert into ORDERS values('1018', 'c001','a03','p04',600,540.00)
insert into ORDERS values('1023', 'c001','a04','p05',500,450.00)
insert into ORDERS values('1022', 'c001','a05','p06',400,720.00)
insert into ORDERS values('1025', 'c001','a05','p07',800,720.00)
insert into ORDERS values('1013', 'c002','a03','p03',1000,880.00)
insert into ORDERS values('1026', 'c002','a05','p03',800,704.00)
insert into ORDERS values('1015', 'c003','a03','p05',1200,1104.00)
insert into ORDERS values('1014', 'c003','a03','p05',1200,1104.00)
insert into ORDERS values('1021', 'c004','a06','p01',1000,460.00)
insert into ORDERS values('1016', 'c006','a01','p01',1000,500.00)
insert into ORDERS values('1020', 'c006','a03','p07',600,600.00)
insert into ORDERS values('1024', 'c006','a06','p01',800,400.00)
通过创建的表我们得到以下几个表：
（1） 客户表
SQL> select * from customers;
CID CNAME CITY DISCNT
---------- ---------- -------------------- ------------
c001 TipTop Duluth 10.00
c002 Basics Dallas 12.00
c003 Allied Dallas 8.00
c004 ACME Duluth 8.00
c006 ACME Kyoto 0.00
（2）产品表
SQL> select * from PRODUCTS;PID PNAME CITY QUANTITY PRICE---------- ---------- -------------------- ---------- ------------p01 comb Dallas 111400 0.50p02 brush Newark 203000 0.50p03 razor Duluth 150600 1.00p04 pen Duluth 125300 1.00p05 pencil Dallas 221400 1.00p06 folder Dallas 123100 2.00p07 case Newark 100500 1.00
（3）代理商表
SQL> select * from agents;--代理商表
AID ANAME CITY PERCENTS
---- ---------- ---------- ------------
a01 Smith New York 6.0000
a02 Jones Newark 6.0000
a03 Brown Tokyo 7.0000
a04 Gray New York 6.0000
a05 Otasi Duluth 5.0000
a06 Smith Dallas 5.0000
（4）订单表
SQL> select * from orders;--订单表数据
ORDNO CID AID PID QTY DOLLARS
----- ---------- ---- ---------- ------ ------------
1011 c001 a01 p01 1000 450.00
1012 c001 a01 p01 1000 450.00
1019 c001 a02 p02 400 180.00
1017 c001 a06 p03 600 540.00
1018 c001 a03 p04 600 540.00
1023 c001 a04 p05 500 450.00
1022 c001 a05 p06 400 720.00
1025 c001 a05 p07 800 720.00
1013 c002 a03 p03 1000 880.00
1026 c002 a05 p03 800 704.00
1015 c003 a03 p05 1200 1104.00
1014 c003 a03 p05 1200 1104.00
1021 c004 a06 p01 1000 460.00
1016 c006 a01 p01 1000 500.00
1020 c006 a03 p07 600 600.00
1024 c006 a06 p01 800 400.00