| layout | topic | title | language |
|---|---|---|---|
exercise |
Aggregation |
COUNT |
SQL |
Write a query that returns the number of individuals trapped in each year for
all known species combined (i.e., where the species_id is not null). Name the
count column total_abundance and sort it chronologically. Include the year in
the output. Save it as total_abundance_by_year. There should only be one value
for each year since this is a count of the individuals across all species in
that year.