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学习DB2数据库必须掌握的五十四条常用语句

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2008-06-01 03:23:21

DB2数据库常用的五十四条语句:

1、查找员工的编号、姓名、部门和出生日期,如果出生日期为空值,显示日期不详,并按部门排序输出,日期格式为yyyy-mm-dd

select emp_no,emp_name,dept,isnull(convert(char(10),birthday,120),'日期不详') birthday

from employee

order by dept

2、查找与喻自强在同一个单位的员工姓名、性别、部门和职称

select emp_no,emp_name,dept,title

from employee

where emp_name<>'喻自强' and dept in

(select dept from employee

where emp_name='喻自强')

3、按部门进行汇总,统计每个部门的总工资

select dept,sum(salary)

from employee

group by dept

4、查找商品名称为14寸显示器商品的销售情况,显示该商品的编号、销售数量、单价和金额

select a.prod_id,qty,unit_price,unit_price*qty totprice

from sale_item a,product b

where a.prod_id=b.prod_id and prod_name='14寸显示器'

5、在销售明细表中按产品编号进行汇总,统计每种产品的销售数量和金额

select prod_id,sum(qty) totqty,sum(qty*unit_price) totprice

from sale_item

group by prod_id

6、使用convert函数按客户编号统计每个客户1996年的订单总金额

select cust_id,sum(tot_amt) totprice

from sales

where convert(char(4),order_date,120)='1996'

group by cust_id

7、查找有销售记录的客户编号、名称和订单总额

select a.cust_id,cust_name,sum(tot_amt) totprice

from customer a,sales b

where a.cust_id=b.cust_id

group by a.cust_id,cust_name

8、查找在1997年中有销售记录的客户编号、名称和订单总额

select a.cust_id,cust_name,sum(tot_amt) totprice

from customer a,sales b

where a.cust_id=b.cust_id and convert(char(4),order_date,120)='1997'

group by a.cust_id,cust_name

9、查找一次销售最大的销售记录

select order_no,cust_id,sale_id,tot_amt

from sales

where tot_amt=

(select max(tot_amt)

from sales)

10、查找至少有3次销售的业务员名单和销售日期

select emp_name,order_date

from employee a,sales b

where emp_no=sale_id and a.emp_no in

(select sale_id

from sales

group by sale_id

having count(*)>=3)

order by emp_name

11、用存在量词查找没有订货记录的客户名称

select cust_name

from customer a

where not exists

(select *

from sales b

where a.cust_id=b.cust_id)

12、使用左外连接查找每个客户的客户编号、名称、订货日期、订单金额订货日期不要显示时间,日期格式为yyyy-mm-dd按客户编号排序,同一客户再按订单降序排序输出

select a.cust_id,cust_name,convert(char(10),order_date,120),tot_amt

from customer a left outer join sales b on a.cust_id=b.cust_id

order by a.cust_id,tot_amt desc

13、查找16M DRAM的销售情况,要求显示相应的销售员的姓名、性别,销售日期、销售数量和金额,其中性别用男、女表示

select emp_name 姓名, 性别= case a.sex when 'm' then '男'

when 'f' then '女'

else '未'

end,

销售日期= isnull(convert(char(10),c.order_date,120),'日期不详'),

qty 数量, qty*unit_price as 金额

from employee a, sales b, sale_item c,product d

where d.prod_name='16M DRAM' and d.prod_id=c.prod_id and

a.emp_no=b.sale_id and b.order_no=c.order_no

14、查找每个人的销售记录,要求显示销售员的编号、姓名、性别、产品名称、数量、单价、金额和销售日期

select emp_no 编号,emp_name 姓名, 性别= case a.sex when 'm' then '男'

when 'f' then '女'

else '未'

end,

prod_name 产品名称,销售日期= isnull(convert(char(10),c.order_date,120),'日期不详'),

qty 数量, qty*unit_price as 金额

from employee a left outer join sales b on a.emp_no=b.sale_id , sale_item c,product d

where d.prod_id=c.prod_id and b.order_no=c.order_no

15、查找销售金额最大的客户名称和总货款

select cust_name,d.cust_sum

from customer a,

(select cust_id,cust_sum

from (select cust_id, sum(tot_amt) as cust_sum

from sales

group by cust_id ) b

where b.cust_sum =

( select max(cust_sum)

from (select cust_id, sum(tot_amt) as cust_sum

from sales

group by cust_id ) c )

) d

where a.cust_id=d.cust_id

16、查找销售总额少于1000元的销售员编号、姓名和销售额

select emp_no,emp_name,d.sale_sum

from employee a,

(select sale_id,sale_sum

from (select sale_id, sum(tot_amt) as sale_sum

from sales

group by sale_id ) b

where b.sale_sum <1000

) d

where a.emp_no=d.sale_id

17、查找至少销售了3种商品的客户编号、客户名称、商品编号、商品名称、数量和金额

select a.cust_id,cust_name,b.prod_id,prod_name,d.qty,d.qty*d.unit_price

from customer a, product b, sales c, sale_item d

where a.cust_id=c.cust_id and d.prod_id=b.prod_id and

c.order_no=d.order_no and a.cust_id in (

select cust_id

from (select cust_id,count(distinct prod_id) prodid

from (select cust_id,prod_id

from sales e,sale_item f

where e.order_no=f.order_no) g

group by cust_id

having count(distinct prod_id)>=3) h )

18、查找至少与世界技术开发公司销售相同的客户编号、名称和商品编号、商品名称、数量和金额

select a.cust_id,cust_name,d.prod_id,prod_name,qty,qty*unit_price

from customer a, product b, sales c, sale_item d

where a.cust_id=c.cust_id and d.prod_id=b.prod_id and

c.order_no=d.order_no and not exists

(select f.*

from customer x ,sales e, sale_item f

where cust_name='世界技术开发公司' and x.cust_id=e.cust_id and

e.order_no=f.order_no and not exists

( select g.*

from sale_item g, sales h

where g.prod_id = f.prod_id and g.order_no=h.order_no and

h.cust_id=a.cust_id)

)

19、查找表中所有姓刘的职工的工号,部门,薪水

select emp_no,emp_name,dept,salary

from employee

where emp_name like '刘%'

20、查找所有定单金额高于2000的所有客户编号

select cust_id

from sales

where tot_amt>2000

21、统计表中员工的薪水在4000-6000之间的人数

select count(*)as 人数

from employee

where salary between 4000 and 6000

22、查询表中的同一部门的职工的平均工资,但只查询"住址"是"上海市"的员工

select avg(salary) avg_sal,dept

from employee

where addr like '上海市%'

group by dept

23、将表中住址为"上海市"的员工住址改为"北京市"

update employee

set addr like '北京市'

where addr like '上海市'

24、查找业务部或会计部的女员工的基本信息

select emp_no,emp_name,dept

from employee

where sex='F'and dept in ('业务','会计')

25、显示每种产品的销售金额总和,并依销售金额由大到小输出

select prod_id ,sum(qty*unit_price)

from sale_item

group by prod_id

order by sum(qty*unit_price) desc

26、选取编号界于'C0001'和'C0004'的客户编号、客户名称、客户地址

select CUST_ID,cust_name,addr

from customer

where cust_id between 'C0001' AND 'C0004'

27、计算出一共销售了几种产品

select count(distinct prod_id) as '共销售产品数'

from sale_item

28、将业务部员工的薪水上调3%

update employee

set salary=salary*1.03

where dept='业务'

29、由employee表中查找出薪水最低的员工信息

select *

from employee

where salary=

(select min(salary )

from employee )

30、使用join查询客户姓名为"客户丙"所购货物的"客户名称","定单金额","定货日期","电话号码"

select a.cust_id,b.tot_amt,b.order_date,a.tel_no

from customer a join sales b

on a.cust_id=b.cust_id and cust_name like '客户丙'

31、由sales表中查找出订单金额大于"E0013业务员在1996/10/15这天所接每一张订单的金额"的所有订单

select *

from sales

where tot_amt>all

(select tot_amt

from sales

where sale_id='E0013'and order_date='1996/10/15')

order by tot_amt

32、计算'P0001'产品的平均销售单价

select avg(unit_price)

from sale_item

where prod_id='P0001'

33、找出公司女员工所接的定单

select sale_id,tot_amt

from sales

where sale_id in

(select sale_id from employee

where sex='F')

34、找出同一天进入公司服务的员工

select a.emp_no,a.emp_name,a.date_hired

from employee a

join employee b

on (a.emp_no!=b.emp_no and a.date_hired=b.date_hired)

order by a.date_hired

35、找出目前业绩超过232000元的员工编号和姓名

select emp_no,emp_name

from employee

where emp_no in

(select sale_id

from sales

group by sale_id

having sum(tot_amt)<232000)

36、查询出employee表中所有女职工的平均工资和住址在"上海市"的所有女职工的平均工资

select avg(salary)

from employee

where sex like 'f'

union

select avg(salary)

from employee

where sex like 'f' and addr like '上海市%'

37、在employee表中查询薪水超过员工平均薪水的员工信息

Select *

from employee

where salary>( select avg(salary)

from employee)

38、 找出目前销售业绩超过10000元的业务员编号及销售业绩,并按销售业绩从大到小排序

Select sale_id ,sum(tot_amt)

from sales

group by sale_id

having sum(tot_amt)>10000

order by sum(tot_amt) desc

39、 找出公司男业务员所接且订单金额超过2000元的订单号及订单金额

Select order_no,tot_amt

From sales ,employee

Where sale_id=emp_no and sex='M' and tot_amt>2000

40、 查询sales表中订单金额最高的订单号及订单金额

Select order_no,tot_amt from sales

where tot_amt=(select max(tot_amt) from sales)

41、 查询在每张订单中订购金额超过4000元的客户名及其地址

Select cust_name,addr from customer a,sales b

where a.cust_id=b.cust_id and tot_amt>4000

42、 求出每位客户的总订购金额,显示出客户号及总订购金额,并按总订购金额降序排列

Select cust_id,sum(tot_amt) from sales

Group by cust_id

Order by sum(tot_amt) desc

43、 求每位客户订购的每种产品的总数量及平均单价,并按客户号,产品号从小到大排列

Select cust_id,prod_id,sum(qty),sum(qty*unit_price)/sum(qty)

From sales a, sale_item b

Where a.order_no=b.order_no

Group by cust_id,prod_id

Order by cust_id,prod_id

44、 查询订购了三种以上产品的订单号

Select order_no

from sale_item

Group by order_no

Having count(*)>3

45、 查询订购的产品至少包含了订单3号中所订购产品的订单

Select distinct order_no

From sale_item a

Where order_no<>'3'and not exists (

Select * from sale_item b where order_no ='3' and not exists

(select * from sale_item c where c.order_no=a.order_no and c.prod_id=b.prod_id))

46、 在sales表中查找出订单金额大于"E0013业务员在1996/11/10这天所接每一张订单的金额"的所有订单,并显示承接这些订单的业务员和该订单的金额

Select sale_id,tot_amt from sales

where tot_amt>all(select tot_amt

from sales

where sale_id='E0013' and order_date='1996-11-10')

47、 查询末承接业务的员工的信息

Select *

From employee a

Where not exists

(select * from sales b where a.emp_no=b.sale_id)

48、 查询来自上海市的客户的姓名,电话、订单号及订单金额

Select cust_name,tel_no,order_no,tot_amt

From customer a ,sales b

Where a.cust_id=b.cust_id and addr='上海市'

49、 查询每位业务员各个月的业绩,并按业务员编号、月份降序排序

Select sale_id,month(order_date), sum(tot_amt)

from sales

group by sale_id,month(order_date)

order by sale_id,month(order_date) desc

50、 求每种产品的总销售数量及总销售金额,要求显示出产品编号、产品名称,总数量及总金额,并按产品号从小到大排列

Select a.prod_id,prod_name,sum(qty),sum(qty*unit_price)

From sale_item a,product b

Where a.prod_id=b.prod_id

Group by a.prod_id,prod_name

Order by a.prod_id

51、 查询总订购金额超过'C0002'客户的总订购金额的客户号,客户名及其住址

Select cust_id, cust_name,addr

From customer

Where cust_id in (select cust_id from sales

Group by cust_id

Having sum(tot_amt)>

(Select sum(tot_amt) from sales where cust_id='C0002'))

52、 查询业绩最好的的业务员号、业务员名及其总销售金额

select emp_no,emp_name,sum(tot_amt)

from employee a,sales b

where a.emp_no=b.sale_id

group by emp_no,emp_name

having sum(tot_amt)=

(select max(totamt)

from (select sale_id,sum(tot_amt) totamt

from sales

group by sale_id) c)

53、 查询每位客户所订购的每种产品的详细清单,要求显示出客户号,客户名,产品号,产品名,数量及单价

select a.cust_id, cust_name,c.prod_id,prod_name,qty, unit_price

from customer a,sales b, sale_item c ,product d

where a.cust_id=b.cust_id and b.order_no=c.order_no and c.prod_id=d.prod_id

54、 求各部门的平均薪水,要求按平均薪水从小到大排序

select dept,avg(salary)

from employee

group by dept

order by avg(salary)

 
DB2数据库常用的五十四条语句: 1、查找员工的编号、姓名、部门和出生日期,如果出生日期为空值,显示日期不详,并按部门排序输出,日期格式为yyyy-mm-dd select emp_no,emp_name,dept,isnull(convert(char(10),birthday,120),'日期不详') birthday from employee order by dept 2、查找与喻自强在同一个单位的员工姓名、性别、部门和职称 select emp_no,emp_name,dept,title from employee where emp_name<>'喻自强' and dept in (select dept from employee where emp_name='喻自强') 3、按部门进行汇总,统计每个部门的总工资 select dept,sum(salary) from employee group by dept 4、查找商品名称为14寸显示器商品的销售情况,显示该商品的编号、销售数量、单价和金额 select a.prod_id,qty,unit_price,unit_price*qty totprice from sale_item a,product b where a.prod_id=b.prod_id and prod_name='14寸显示器' 5、在销售明细表中按产品编号进行汇总,统计每种产品的销售数量和金额 select prod_id,sum(qty) totqty,sum(qty*unit_price) totprice from sale_item group by prod_id 6、使用convert函数按客户编号统计每个客户1996年的订单总金额 select cust_id,sum(tot_amt) totprice from sales where convert(char(4),order_date,120)='1996' group by cust_id 7、查找有销售记录的客户编号、名称和订单总额 select a.cust_id,cust_name,sum(tot_amt) totprice from customer a,sales b where a.cust_id=b.cust_id group by a.cust_id,cust_name 8、查找在1997年中有销售记录的客户编号、名称和订单总额 select a.cust_id,cust_name,sum(tot_amt) totprice from customer a,sales b where a.cust_id=b.cust_id and convert(char(4),order_date,120)='1997' group by a.cust_id,cust_name 9、查找一次销售最大的销售记录 select order_no,cust_id,sale_id,tot_amt from sales where tot_amt= (select max(tot_amt) from sales) 10、查找至少有3次销售的业务员名单和销售日期 select emp_name,order_date from employee a,sales b where emp_no=sale_id and a.emp_no in (select sale_id from sales group by sale_id having count(*)>=3) order by emp_name 11、用存在量词查找没有订货记录的客户名称 select cust_name from customer a where not exists (select * from sales b where a.cust_id=b.cust_id) 12、使用左外连接查找每个客户的客户编号、名称、订货日期、订单金额订货日期不要显示时间,日期格式为yyyy-mm-dd按客户编号排序,同一客户再按订单降序排序输出 select a.cust_id,cust_name,convert(char(10),order_date,120),tot_amt from customer a left outer join sales b on a.cust_id=b.cust_id order by a.cust_id,tot_amt desc 13、查找16M DRAM的销售情况,要求显示相应的销售员的姓名、性别,销售日期、销售数量和金额,其中性别用男、女表示 select emp_name 姓名, 性别= case a.sex when 'm' then '男' when 'f' then '女' else '未' end, 销售日期= isnull(convert(char(10),c.order_date,120),'日期不详'), qty 数量, qty*unit_price as 金额 from employee a, sales b, sale_item c,product d where d.prod_name='16M DRAM' and d.prod_id=c.prod_id and a.emp_no=b.sale_id and b.order_no=c.order_no 14、查找每个人的销售记录,要求显示销售员的编号、姓名、性别、产品名称、数量、单价、金额和销售日期 select emp_no 编号,emp_name 姓名, 性别= case a.sex when 'm' then '男' when 'f' then '女' else '未' end, prod_name 产品名称,销售日期= isnull(convert(char(10),c.order_date,120),'日期不详'), qty 数量, qty*unit_price as 金额 from employee a left outer join sales b on a.emp_no=b.sale_id , sale_item c,product d where d.prod_id=c.prod_id and b.order_no=c.order_no 15、查找销售金额最大的客户名称和总货款 select cust_name,d.cust_sum from customer a, (select cust_id,cust_sum from (select cust_id, sum(tot_amt) as cust_sum from sales group by cust_id ) b where b.cust_sum = ( select max(cust_sum) from (select cust_id, sum(tot_amt) as cust_sum from sales group by cust_id ) c ) ) d where a.cust_id=d.cust_id 16、查找销售总额少于1000元的销售员编号、姓名和销售额 select emp_no,emp_name,d.sale_sum from employee a, (select sale_id,sale_sum from (select sale_id, sum(tot_amt) as sale_sum from sales group by sale_id ) b where b.sale_sum <1000 ) d where a.emp_no=d.sale_id 17、查找至少销售了3种商品的客户编号、客户名称、商品编号、商品名称、数量和金额 select a.cust_id,cust_name,b.prod_id,prod_name,d.qty,d.qty*d.unit_price from customer a, product b, sales c, sale_item d where a.cust_id=c.cust_id and d.prod_id=b.prod_id and c.order_no=d.order_no and a.cust_id in ( select cust_id from (select cust_id,count(distinct prod_id) prodid from (select cust_id,prod_id from sales e,sale_item f where e.order_no=f.order_no) g group by cust_id having count(distinct prod_id)>=3) h ) 18、查找至少与世界技术开发公司销售相同的客户编号、名称和商品编号、商品名称、数量和金额 select a.cust_id,cust_name,d.prod_id,prod_name,qty,qty*unit_price from customer a, product b, sales c, sale_item d where a.cust_id=c.cust_id and d.prod_id=b.prod_id and c.order_no=d.order_no and not exists (select f.* from customer x ,sales e, sale_item f where cust_name='世界技术开发公司' and x.cust_id=e.cust_id and e.order_no=f.order_no and not exists ( select g.* from sale_item g, sales h where g.prod_id = f.prod_id and g.order_no=h.order_no and h.cust_id=a.cust_id) ) 19、查找表中所有姓刘的职工的工号,部门,薪水 select emp_no,emp_name,dept,salary from employee where emp_name like '刘%' 20、查找所有定单金额高于2000的所有客户编号 select cust_id from sales where tot_amt>2000 21、统计表中员工的薪水在4000-6000之间的人数 select count(*)as 人数 from employee where salary between 4000 and 6000 22、查询表中的同一部门的职工的平均工资,但只查询"住址"是"上海市"的员工 select avg(salary) avg_sal,dept from employee where addr like '上海市%' group by dept 23、将表中住址为"上海市"的员工住址改为"北京市" update employee set addr like '北京市' where addr like '上海市' 24、查找业务部或会计部的女员工的基本信息 select emp_no,emp_name,dept from employee where sex='F'and dept in ('业务','会计') 25、显示每种产品的销售金额总和,并依销售金额由大到小输出 select prod_id ,sum(qty*unit_price) from sale_item group by prod_id order by sum(qty*unit_price) desc 26、选取编号界于'C0001'和'C0004'的客户编号、客户名称、客户地址 select CUST_ID,cust_name,addr from customer where cust_id between 'C0001' AND 'C0004' 27、计算出一共销售了几种产品 select count(distinct prod_id) as '共销售产品数' from sale_item 28、将业务部员工的薪水上调3% update employee set salary=salary*1.03 where dept='业务' 29、由employee表中查找出薪水最低的员工信息 select * from employee where salary= (select min(salary ) from employee ) 30、使用join查询客户姓名为"客户丙"所购货物的"客户名称","定单金额","定货日期","电话号码" select a.cust_id,b.tot_amt,b.order_date,a.tel_no from customer a join sales b on a.cust_id=b.cust_id and cust_name like '客户丙' 31、由sales表中查找出订单金额大于"E0013业务员在1996/10/15这天所接每一张订单的金额"的所有订单 select * from sales where tot_amt>all (select tot_amt from sales where sale_id='E0013'and order_date='1996/10/15') order by tot_amt 32、计算'P0001'产品的平均销售单价 select avg(unit_price) from sale_item where prod_id='P0001' 33、找出公司女员工所接的定单 select sale_id,tot_amt from sales where sale_id in (select sale_id from employee where sex='F') 34、找出同一天进入公司服务的员工 select a.emp_no,a.emp_name,a.date_hired from employee a join employee b on (a.emp_no!=b.emp_no and a.date_hired=b.date_hired) order by a.date_hired 35、找出目前业绩超过232000元的员工编号和姓名 select emp_no,emp_name from employee where emp_no in (select sale_id from sales group by sale_id having sum(tot_amt)<232000) 36、查询出employee表中所有女职工的平均工资和住址在"上海市"的所有女职工的平均工资 select avg(salary) from employee where sex like 'f' union select avg(salary) from employee where sex like 'f' and addr like '上海市%' 37、在employee表中查询薪水超过员工平均薪水的员工信息 Select * from employee where salary>( select avg(salary) from employee) 38、 找出目前销售业绩超过10000元的业务员编号及销售业绩,并按销售业绩从大到小排序 Select sale_id ,sum(tot_amt) from sales group by sale_id having sum(tot_amt)>10000 order by sum(tot_amt) desc 39、 找出公司男业务员所接且订单金额超过2000元的订单号及订单金额 Select order_no,tot_amt From sales ,employee Where sale_id=emp_no and sex='M' and tot_amt>2000 40、 查询sales表中订单金额最高的订单号及订单金额 Select order_no,tot_amt from sales where tot_amt=(select max(tot_amt) from sales) 41、 查询在每张订单中订购金额超过4000元的客户名及其地址 Select cust_name,addr from customer a,sales b where a.cust_id=b.cust_id and tot_amt>4000 42、 求出每位客户的总订购金额,显示出客户号及总订购金额,并按总订购金额降序排列 Select cust_id,sum(tot_amt) from sales Group by cust_id Order by sum(tot_amt) desc 43、 求每位客户订购的每种产品的总数量及平均单价,并按客户号,产品号从小到大排列 Select cust_id,prod_id,sum(qty),sum(qty*unit_price)/sum(qty) From sales a, sale_item b Where a.order_no=b.order_no Group by cust_id,prod_id Order by cust_id,prod_id 44、 查询订购了三种以上产品的订单号 Select order_no from sale_item Group by order_no Having count(*)>3 45、 查询订购的产品至少包含了订单3号中所订购产品的订单 Select distinct order_no From sale_item a Where order_no<>'3'and not exists ( Select * from sale_item b where order_no ='3' and not exists (select * from sale_item c where c.order_no=a.order_no and c.prod_id=b.prod_id)) 46、 在sales表中查找出订单金额大于"E0013业务员在1996/11/10这天所接每一张订单的金额"的所有订单,并显示承接这些订单的业务员和该订单的金额 Select sale_id,tot_amt from sales where tot_amt>all(select tot_amt from sales where sale_id='E0013' and order_date='1996-11-10') 47、 查询末承接业务的员工的信息 Select * From employee a Where not exists (select * from sales b where a.emp_no=b.sale_id) 48、 查询来自上海市的客户的姓名,电话、订单号及订单金额 Select cust_name,tel_no,order_no,tot_amt From customer a ,sales b Where a.cust_id=b.cust_id and addr='上海市' 49、 查询每位业务员各个月的业绩,并按业务员编号、月份降序排序 Select sale_id,month(order_date), sum(tot_amt) from sales group by sale_id,month(order_date) order by sale_id,month(order_date) desc 50、 求每种产品的总销售数量及总销售金额,要求显示出产品编号、产品名称,总数量及总金额,并按产品号从小到大排列 Select a.prod_id,prod_name,sum(qty),sum(qty*unit_price) From sale_item a,product b Where a.prod_id=b.prod_id Group by a.prod_id,prod_name Order by a.prod_id 51、 查询总订购金额超过'C0002'客户的总订购金额的客户号,客户名及其住址 Select cust_id, cust_name,addr From customer Where cust_id in (select cust_id from sales Group by cust_id Having sum(tot_amt)> (Select sum(tot_amt) from sales where cust_id='C0002')) 52、 查询业绩最好的的业务员号、业务员名及其总销售金额 select emp_no,emp_name,sum(tot_amt) from employee a,sales b where a.emp_no=b.sale_id group by emp_no,emp_name having sum(tot_amt)= (select max(totamt) from (select sale_id,sum(tot_amt) totamt from sales group by sale_id) c) 53、 查询每位客户所订购的每种产品的详细清单,要求显示出客户号,客户名,产品号,产品名,数量及单价 select a.cust_id, cust_name,c.prod_id,prod_name,qty, unit_price from customer a,sales b, sale_item c ,product d where a.cust_id=b.cust_id and b.order_no=c.order_no and c.prod_id=d.prod_id 54、 求各部门的平均薪水,要求按平均薪水从小到大排序 select dept,avg(salary) from employee group by dept order by avg(salary)
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