DB2数据库的常用命令之前已经为大家介绍过了，即DB2数据库必须掌握的常用语句（一），接下来就为大家介绍更多的DB2数据库常用语句。
1、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)
2、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
3、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
4、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
5、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
6、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
7、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 )
8、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)
)
9、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%'
10、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
很高兴与大家分享DB2数据库常用语句，希望能对大家有所帮助。
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