feat: [datasets/gbif] Add a query to uncover species found in one reg…

…ion only (#388)

datasets/gbif/docs/queries/artifact.yaml

@@ -0,0 +1,5 @@
+artifact:
+  title: Species Found Only in One Region
+  description: Using this query, we uncover which species have only been found in one single region.
+  vertical: environment
+  tier: free

datasets/gbif/docs/queries/find_single_region_species.sql

@@ -0,0 +1,19 @@
+WITH
+  intermediate AS (
+  SELECT
+    species,
+    COUNT(*) AS count,
+    MAX(decimallatitude) - MIN(decimallatitude) AS latitude_diff,
+    MAX(decimallongitude) - MIN(decimallongitude) AS longitude_diff
+  FROM
+    `bigquery-public-data.gbif.occurrences` TABLESAMPLE SYSTEM (100 PERCENT)
+  WHERE
+    decimallatitude IS NOT NULL AND decimallongitude IS NOT NULL
+  GROUP BY species)
+SELECT *
+FROM intermediate
+WHERE
+  latitude_diff < 1 AND
+  longitude_diff < 1 AND
+  count > 1000
+ORDER BY count DESC;