I have data that looks like this:
school district crs_sbj crs_num crs_sec
CANYON HIGH IRON DISTRICT ENGL 2010 213
CANYON HIGH IRON DISTRICT ENGL 2010 214
CANYON HIGH IRON DISTRICT ENGL 1010 110
CANYON HIGH IRON DISTRICT MATH 1010 400
WAYNE HIGH WAYNE DISTRICT MATH 1010 321
WAYNE HIGH WAYNE DISTRICT MATH 1010 322
WAYNE HIGH WAYNE DISTRICT ENGL 1010 500
I want to count the unique classes offered at each individual high school. For example, I want to see:
count school
3 CANYON HIGH
2 WAYNE HIGH
How would I go about doing this? I understand the concept of one column, but how about two?
Try this:
select school, count(distinct crs_num) _count
from table
group by school;
Select School, count(distinct crs_num)
from table
group by School
I am unsure what constitutes a unique class.
; with aardvark (select distinct school, district, crs_sbj, crs_num
from T)
select district, school, count(*)
from aardvark
group by school, district
Since the same school name can be used across districts, I included the district in the grouping.
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