create table sale
(id int,
name varchar(10),
sdate datetime,
money int)
insert into sale values (1,'西瓜','2015-01-01',10)
insert into sale values (2,'香蕉','2015-01-05',20)
insert into sale values (3,'苹果','2015-02-01',60)
insert into sale values (4,'葡萄','2015-02-23',345)
insert into sale values (5,'柚子','2015-04-23',10)
insert into sale values (6,'牛奶','2015-05-12',67)
insert into sale values (7,'地瓜','2015-06-01',10)
insert into sale values (8,'土豆','2015-07-01',10)
insert into sale values (9,'土豆','2016-07-01',10)
如何根据我自己要查找的年份来显示每月的金额 ,如果某个月销售为0,就显示为0