SQL Syntax - how to group by interval

发现原来用SQL也可以group by interval，实现了类似SciQL里的grid grouping，虽然粒度只是1维上的grid，即interval。

In postgres (where || is the string concatenation operator):

select (score/10)*10 || '-' || (score/10)*10+9 as scorerange, count(*)
from scores
group by score/10
order by 1

gives:

scorerange | count 

------------+-------
 0-9           |    11
 10-19      |    14
 20-29      |     3
 30-39      |     2