From 20219dd4f7192c61492b7667dd3f15b05dbba044 Mon Sep 17 00:00:00 2001
From: Martin Kagamino Lehoux <martin@lehoux.net>
Date: Sat, 23 Sep 2023 20:19:44 +0200
Subject: feat: Add post to version control

---
 content/posts/postgres-aggregates/aggregation.sql | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 content/posts/postgres-aggregates/aggregation.sql

(limited to 'content/posts/postgres-aggregates/aggregation.sql')

diff --git a/content/posts/postgres-aggregates/aggregation.sql b/content/posts/postgres-aggregates/aggregation.sql
new file mode 100644
index 0000000..ebb9ed5
--- /dev/null
+++ b/content/posts/postgres-aggregates/aggregation.sql
@@ -0,0 +1,20 @@
+EXPLAIN (
+  ANALYZE,
+  COSTS,
+  VERBOSE,
+  BUFFERS
+)
+SELECT
+  products.id AS product_id,
+  products.name AS product_name,
+  COUNT(DISTINCT reviews.id) AS num_reviews,
+  COUNT(DISTINCT orders.id) AS num_orders
+FROM
+  products
+  LEFT JOIN reviews ON reviews.product_id = products.id
+  LEFT JOIN orders ON orders.product_id = products.id
+  -- WHERE
+  --   products.id % 10 = 0
+GROUP BY
+  products.id;
+
-- 
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