以下是我的客户表:
create table CUSTOMERS
(CustID char(6) unique Not null,
Name varchar(45),
Address varchar(40),
City varchar(30),
State varchar(2),
Zip varchar(9),
AreaCode char(3),
Phone varchar (9),
RepID char(4) not null,
CreditLimit decimal(9,2),
Primary key(CustID),
Foreign key(RepID) References EMPLOYEES(EmpID));
insert into CUSTOMERS values (100,'Jocksports','345 Viewridge','Belmont','CA','96711',415,'598-6609',7844,5000);
insert into CUSTOMERS values (101,'TKB Sport Shop','490 Boli Rd.','Redwood City','CA','94061',415,'368-1223',7521,10000);
insert into CUSTOMERS values (102,'Vollyrite','9722 Hamilton','Burlingame','CA','95133',415,'644-3341',7654,7000);
insert into CUSTOMERS values (103,'Just Tennis','Hillview Mall','Burlingame','CA','97544',415,'677-9312',7521,3000);
insert into CUSTOMERS values (104,'Every Mountain','574 Surry Rd.','Cupertino','CA','93301',408,'996-2323',7499,10000);
insert into CUSTOMERS values (105,'K + T Sports','3476 El Paseo','Santa Clara','CA','91003',408,'376-9966',7844,5000);
insert into CUSTOMERS values (106,'Shape Up','908 Sequoia','Palo Alto','CA','94301',415,'364-9777',7521,6000);
insert into CUSTOMERS values (107,'Womens Sports','Valco Village','Sunnyvale','CA','93301',408,'967-4398',7499,10000);
insert into CUSTOMERS values (108,'North Woods Fitness Supply Center','98 Lone Pine Way','Hibbing','MN','55649',612,'566-9123',7844,8000);
以下是我需要修改的查询:
select name, creditlimit
from CUSTOMERS
where name in
(select name
from CUSTOMERS
where City = 'sunnyvale');
我无法在任何地方找到示例来回答以下提示:
编写嵌套查询以显示信用额度低于桑尼维尔客户的客户名称和信用额度。首先列出最低信用额度。
试试这个
SELECT Name,CREDITLIMIT FROM CUSTOMERS
WHERE CREDITLIMIT < (SELECT CREDITLIMIT FROM CUSTOMERS
WHERE CITY = 'Sunnyvale')
ORDER BY CREDITLIMIT
如果桑尼维尔有多个客户,您可以使用 MIN 或 MAX
SELECT Name,CREDITLIMIT FROM CUSTOMERS
WHERE CREDITLIMIT < (SELECT MAX(CREDITLIMIT) FROM CUSTOMERS
WHERE CITY = 'Sunnyvale')
ORDER BY CREDITLIMIT
此查询将导致订购您想要的东西。
SELECT CreditLimit, Name
FROM CUSTOMERS
WHERE CreditLimit < (
SELECT CreditLImit
FROM CUSTOMERS
WHERE City = 'sunnyvale' )
ORDER BY CreditLimit
select name, creditlimit
from CUSTOMERS
where creditlimit <
(select CreditLimit
from CUSTOMERS
where City = 'sunnyvale') order by CreditLimit
尝试以上查询。
这是演示:
● 状态不应包含空值 ● 信用额度须在50000至100000之间