differences for PR #382

datacarpentry · Jan 23, 2025 · 11ed81f · 11ed81f
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diff --git a/02-sql-aggregation.md b/02-sql-aggregation.md
@@ -226,8 +226,13 @@ Write a query that returns, from the `species` table, the number of
 
 ## Solution
 
+This query counts the number of species records that contain each value of the `taxa` field and names that result `species_count`.
+The `GROUP BY` clause means the query will create an aggregated table with one row for each taxa.
+Only those `taxa` values that have more than ten records will be included because of the `HAVING` clause.
+This filtering is applied _after_ grouping has been done.
+
 ```sql
-SELECT taxa, COUNT(*) AS n
+SELECT taxa, COUNT(*) AS species_count
 FROM species
 GROUP BY taxa
 HAVING n > 10;

diff --git a/md5sum.txt b/md5sum.txt
@@ -7,7 +7,7 @@
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 "episodes/00-sql-introduction.md" "e8ac248b290e74c264817c41dbbad159" "site/built/00-sql-introduction.md" "2024-09-11"
 "episodes/01-sql-basic-queries.md" "256c3e6db6f844897ae9643129609c31" "site/built/01-sql-basic-queries.md" "2024-09-11"
-"episodes/02-sql-aggregation.md" "07784e3014a42660059c18e6ba71f26d" "site/built/02-sql-aggregation.md" "2023-04-21"
+"episodes/02-sql-aggregation.md" "c4c4ff7322aaf1aebc1dc9da7f61b1b4" "site/built/02-sql-aggregation.md" "2025-01-23"
 "episodes/03-sql-joins.md" "7ce22e3c1e1719ad50edbcd72e333013" "site/built/03-sql-joins.md" "2024-06-03"
 "instructors/instructor-notes.md" "105728ef72c768e968ca9d11c2a14109" "site/built/instructor-notes.md" "2023-04-21"
 "learners/discuss.md" "0ff402a01b3496a37bf790b8eae69b76" "site/built/discuss.md" "2024-09-11"