求：取出记录的总和要符合某个条件
用户，数量，日期
name,num,date
a,1,2012-02-01
a,1,2012-03-05
b,10,2012-02-03
a,3,2012-02-09
c,2,2012-04-05
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搜索条件是：取出: 2012-02月的用户，总数量要>=2
结果：
a,4,2012-02
b,10,2012-02
[解决办法]
select name,sum(num),format(date,'%Y-%m')from table1where date between '2012-02-01' and '2012-02-29'group by namehaving sum(num)>=2
[解决办法]
select name,sum(num),'2012-02'
from table1
where date >'2012-02-01' and date<'2012-03-01'
group by name
having sum(num)>=2
