From 7d6c401dd314145bac303663921a629bd7132afd Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=C3=96nder=20Kalac=C4=B1?= Date: Fri, 6 Oct 2023 13:37:37 +0300 Subject: [PATCH] Update technical readme (#7248) Fix a wrong query, reported by @naisila --- src/backend/distributed/README.md | 10 ++-------- 1 file changed, 2 insertions(+), 8 deletions(-) diff --git a/src/backend/distributed/README.md b/src/backend/distributed/README.md index f64263ed2..0a3164e0f 100644 --- a/src/backend/distributed/README.md +++ b/src/backend/distributed/README.md @@ -447,14 +447,8 @@ WHERE orders_table.user_id = distinct_user_id; #### Subquery in Target List ```sql --- Sum of max price per product category, filtered by a subquery in the target list -SELECT - (SELECT MAX(price) FROM products_table p WHERE p.category = o.category), - COUNT(DISTINCT o.product_id) -FROM orders_table o, users_table u -WHERE o.user_id = u.user_id AND u.user_id IN -(SELECT user_id FROM special_users_table) -GROUP BY o.category; +-- retrieves the most recent order date for each user +SELECT (SELECT MAX(order_date) FROM orders_table o WHERE o.user_id = u.user_id) FROM users_table u; ``` #### Subquery in WHERE Clause