Hi,
I'm trying to figure out how to count the number of rows within a fixed range of the current row value. My table looks
likethis:
SELECT chr_pos
FROM mutations_crosstab_9615_99
WHERE bta = 38
LIMIT 10
chr_pos
138
140
163
174
187
187
188
208
210
213
chr_pos is integer and represents the base pair position along a chromosome.
It looks to me like a window function would be appropriate but I cannot figure out the correct syntax. What I want to
dois count the number of rows within +/- 20 of chr_pos (the current row). Given the above example, for chr_pos = 138 I
wantthe count of rows between 118 and 158. For chr_pos 187 I want the count of rows between 167 and 207 etc for all
rows. The result I'm looking for should look like the following:
chr_pos,num_variants
138,2
140,2
163,2
174,4
187,4
187,4
188,4
208,6
210,3
213,1
Is there a way to do this with a window function? Any help would be appreciated.
Thanks
Bob