请问一个sql的有关问题

请教一个sql的问题
我表A中有3列
a(金额)           ,b（编号）           ,c（用户编号），t(时间)

表B中有3列
c(用户编号)         d（用户名）         e（密码）
我想得到
在某个时间段内，对于交易金额大于某一个常数   比如说2000的用户在该时间段内的每一条交易记录
请问这个语句怎么写？

[解决办法]
select a.a,a.b,a.c,a.t,b.d
from A a,
B b
where a.c=b.c
and a.c in (select c from a where t between t1 and t2 group by c having sum(a) > 2000)
[解决办法]
select a,b,A.c,t,d from A ,b
where A.c =B.c
and t between StartTime and EndTime
and c in
(
select c from A where t between StartTime and EndTime
group by c
having sum(a)> 某个常数
)
order by A.c, t
;

[解决办法]
select a.a,a.b,a.c,a.t,b.d
from A a,
B b
where a.c=b.c
and a.t between t1 and t2
and a.c in (select c from a where t between t1 and t2 group by c having sum(a) > 2000)

忘加时间了
[解决办法]
select a,b,A.c,t,d from A ,b
where A.c =B.c
and
(
select a1.c, sum(a1.a) from A a1 where a1.t between StartTime and EndTime and
a1.c = a.a
group by a1.c
having sum(a1.a)> 2000)