DB2数据库必须掌握的常用语句：

1、 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

2、 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

3、 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))

4、 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')

5、 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)

6、 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'

7、 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

8、 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

9、 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'))

10、 查询业绩***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)

11、 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

12、 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)