How to sum the amount

Question

how can I add the amount shown below for year 1999. I would like to add all the amount between 01/22/1999 - 12/17/1999. thank you
here is my simple sql looks like
select sum(l.contamt),b.datelet
from bidlet b, letprop l
where b.LETTING = l.LETTING
and l.LETSTAT='A'
group by b.datelet
Here is my desired out put
Amount year
xxxxxx 1999
xxxxx 2000
xxxxxx 2001
24,692,441     01/22/1999 00:00:00
30,625,058     02/26/1999 00:00:00
810,879     03/16/1999 00:00:00
45,415,715     03/19/1999 00:00:00
34,359,502     04/09/1999 00:00:00
34,967,761     04/23/1999 00:00:00
1,396,831     05/04/1999 00:00:00
40,408,333     05/14/1999 00:00:00
37,556,062     05/28/1999 00:00:00
19,583,374     06/11/1999 00:00:00
45,105,742     06/25/1999 00:00:00
6,096,878     07/23/1999 00:00:00
369,439     08/17/1999 00:00:00
15,293,129     08/27/1999 00:00:00
9,249,995     09/10/1999 00:00:00
9,078,176     09/24/1999 00:00:00
2,153,323      10/22/1999 00:00:00
6,239,335     11/19/1999 00:00:00
26,908,007     12/17/1999 00:00:00

Answer 1

user452051 wrote:
how can I add the amount shown below for year 1999.You're very nearly there - all you need to do is convert your dates so they all represent just the year part - you can do this by using the TRUNC function to set the dates to the start of whatever year they belong to:
eg.
TRUNC(sysdate, 'yyyy')