Slackware中文帮助文档（第一章 Slackware Linux简介）

表中数据的查询
制作人：丁琪 QQ：854804038
一、在market数据库中：
说明：
market数据库三张表(customers,goods,orders)
goods商品表(name商品名，storage库存量，supplier供应商，status商品状态，price商品价格)
orders订单表(orderid订单编号，goodsname商品名，customerid客户编号，quantity订货数量，ordersum订货金额，orderdate订货日期)
1、从goods表中查询所有商品信息：select * from goods



2、从customers表中查询客户的姓名和电话：select lastname as '用户姓名',tel as '用户电话' from customers



3、查询customers表，显示客户编号和客户姓名，使customerid列显示的列名为“客户编号”，将lastname和firstname列组合起来成为结果集中的“姓名”列：select customerid as '客户编号',(lastname+'，'+firstname)as '姓名' from customers



4、查看哪些货品有订单。(查询订单表中商品名，去掉重复商品名)：select distinct goodsname as '商品名' from orders



5、查看订货金额最大的前三笔订单：select top 3 ordersum as '订货金额' from orders order by ordersum desc



6、查看货品“tv”的货存量情况：select name,storage from goods where name='tv'



7、查看库存量大于4的货品：select name as '货品名称',storage as '库存量' from goods where storage>4



8、查询发生在2007/4/17日到2007/4/18日之间的订单：select orderid,goodsname,customerid,quantity,ordersum,orderdate from orders
where orderdate>='2007-4-17'and orderdate<='2007-4-19'



9、查询北京、上海、天津三地的客户：select firstname,lastname,city from customers where city='北京'or city='上海'or city='天津'



10、查询电话号码第一位不是8的客户：select firstname,lastname,tel from customers where tel not like '8%'



11、查询所有customers表中没有登记电话号码的客户：select * from customers where tel is null



12、查询货品为"tv"且订货金额大于5000的订单：select * from orders where goodsname='tv' and ordersum>5000



13、查找goods表中最贵的定价：select max(ordersum)as '最贵的定价'from orders



14、查询客户的个数：select count(customerid) as '客户的个数' from customers



15、查询订单表中每一种货品的订货总数：select goodsname as '商品名',sum(quantity) as '订货数量' from orders group by goodsname



16、查询订货总数大于500的货品：select sum(quantity) as '订货数量',goodsname as '商品名' from orders group by goodsname
having sum(quantity)>500



17、查询在2007/4/18日之后的订单的金额：select ordersum as '订货金额',orderdate as '订货日期' from orders where orderdate>'2007-4-18'



18、查询在2007/4/18日之后的订单的金额，并统计每种货品的订单总金额啊：select orderid,goodsname,customerid,quantity,ordersum,orderdate from orders
where orderdate>'2007-04-18' order by goodsname compute sum(ordersum) by goodsname