一些常用的 sql语句总结

-- 查询卖最好的商品名称

select goods_name from indent_detail GROUP BY goods_id ORDER BY sum(goods_num) limit 1;

-- 查询张三购买过的商品名称

select goods_name

from user join indent on indent.user_id=`user`.id

join indent_detail on indent.id=indent_detail.indent_id

where username='zhansan'

-- 查询消费金额最多的用户名称

select username

from indent join user on `user`.id=indent.user_id

GROUP BY indent.user_id

order by sum(total_price) DESC

limit 1

-- 查询订单量最多的省份名称

select region_name from indent join region

on indent.province = region.region_id

GROUP BY indent.province

order by count(*) desc limit 1

-- 查询2014年各个省份的订单数量以及订单总金额 显示格式 省份名称 订单数量 订单总金额

select region_name ,count(*) as number,sum(total_price) as total from indent join region

on indent.province = region.region_id

where year(add_time)=2014

GROUP BY indent.province

-- 查询山东省最近三个月的订单数量

select count(*) as number from indent join region

on indent.province = region.region_id

where region_name='安徽'

and date_sub(curdate(),INTERVAL 3 MONTH)<=add_time

-- 查询最近三天卖的最好的前十件商品名称

select goods_name

from indent_detail join indent on indent.id=indent_detail.indent_id

where TO_DAYS(now())-TO_DAYS(add_time)<=3

GROUP BY goods_id ORDER BY sum(goods_num) desc limit 10;

select goods_name

from indent_detail join indent on indent.id=indent_detail.indent_id

where date_sub(CURDATE(),INTERVAL 3 day)<=add_time

GROUP BY goods_id ORDER BY sum(goods_num) desc limit 10;

-- 查询安徽省滁州市最近三天的订单

select * from indent join region

on indent.city = region.region_id

where region_name='滁州'

and date_sub(curdate(),INTERVAL 3 MONTH)<=add_time