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Update technical readme (#7248) 

Fix a wrong query, reported by @naisila
pull/7247/head^2
Önder Kalacı 2023-10-06 13:37:37 +03:00 committed by GitHub
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src/backend/distributed/README.md
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@ -447,14 +447,8 @@ WHERE orders_table.user_id = distinct_user_id;
#### Subquery in Target List #### Subquery in Target List
```sql ```sql
-- Sum of max price per product category, filtered by a subquery in the target list -- retrieves the most recent order date for each user
SELECT SELECT (SELECT MAX(order_date) FROM orders_table o WHERE o.user_id = u.user_id) FROM users_table u;
(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;
``` ```
#### Subquery in WHERE Clause #### Subquery in WHERE Clause