The table has,

Date,Time,SubType,Value as columns

3/1/2006,7:00a.m,a,3
3/1/2006,7:00a.m,a,1
3/1/2006,7:00a.m,a,1
3/1/2006,7:03a.m,a,3
3/1/2006,7:03a.m,a,4
3/1/2006,7:03a.m,a,5
3/1/2006,7:06a.m,a,6
3/1/2006,7:06a.m,a,1
3/1/2006,7:06a.m,a,2
3/1/2006,7:09a.m,a,3
3/1/2006,7:09a.m,a,5
3/1/2006,7:09a.m,a,4
3/1/2006,7:12a.m,b,3

3/1/2006,7:12a.m,b,2
3/1/2006,7:12a.m,b,1