From d989ceedf3b78cf44acbb169d8afab856ee00792 Mon Sep 17 00:00:00 2001
From: Dmitry Medvedev <dmitri.medv15@gmail.com>
Date: Thu, 4 Jun 2026 15:05:34 +0500
Subject: [PATCH] made changes in joins

---
 dmedvedev/{joins. sql => joins.sql} | 34 ++++++++++++++---------------
 1 file changed, 17 insertions(+), 17 deletions(-)
 rename dmedvedev/{joins. sql => joins.sql} (92%)

diff --git a/dmedvedev/joins. sql b/dmedvedev/joins.sql
similarity index 92%
rename from dmedvedev/joins. sql
rename to dmedvedev/joins.sql
index 7807e41..9204bfa 100644
--- a/dmedvedev/joins. sql
+++ b/dmedvedev/joins.sql
@@ -79,7 +79,7 @@ SELECT
 	o.id AS order_id,
 	o.status AS status
 FROM users u
-FULL JOIN orders o ON o.user_id = u.id;
+LEFT JOIN orders o ON o.user_id = u.id;
 
 /*
 **✅ После выполнения:**
@@ -97,8 +97,8 @@ FULL JOIN orders o ON o.user_id = u.id;
 SELECT 
 	o.user_id AS user_id,
 	u.name AS user_name
-FROM orders o
-FULL JOIN users u ON o.user_id = u.id
+FROM users u
+LEFT JOIN orders o ON o.user_id = u.id
 WHERE user_id IS NULL;
 
 /* **❓ Ответь на вопросы:** 
@@ -119,9 +119,9 @@ SELECT
 	p.name AS product_name,
 	oi.quantity AS quantity
 FROM order_items oi
-FULL JOIN orders o ON o.id = oi.order_id
-FULL JOIN users u ON o.user_id = u.id
-FULL JOIN products p ON p.id = oi.product_id
+JOIN orders o ON o.id = oi.order_id
+JOIN users u ON o.user_id = u.id
+JOIN products p ON p.id = oi.product_id
 WHERE p.name = 'Kindle';
 
 /*Ответь на вопросы:**
@@ -138,9 +138,9 @@ SELECT
 	p.name AS product_name,
 	oi.order_id AS order_id,
 	oi.quantity AS quantity
-FROM order_items oi
-FULL JOIN orders o ON o.id = oi.order_id
-FULL JOIN products p ON p.id = oi.product_id
+FROM products p
+FULL JOIN order_items oi ON p.id = oi.product_id
+ORDER BY p.name
 
 /*❓ Ответь на вопросы:
 что будет в order_id, если товар ни разу не покупали?
@@ -179,9 +179,9 @@ SELECT
 	oi.quantity AS quantity,
 	oi.price_at_purchase AS price_at_purchase
 FROM order_items oi
-FULL JOIN orders o ON o.id = oi.order_id
-FULL JOIN products p ON p.id = oi.product_id
-FULL JOIN users u ON u.id = o.user_id
+JOIN orders o ON o.id = oi.order_id
+JOIN products p ON p.id = oi.product_id
+JOIN users u ON u.id = o.user_id
 WHERE u.name = 'Alice';
 
 /**❓ Ответь на вопросы:**
@@ -195,11 +195,11 @@ SELECT
 	oi.order_id AS order_id,
 	o.user_id AS user_id,
 	o.status AS status,
-	u.name AS name
-FROM order_items oi
-FULL JOIN orders o ON o.id = oi.order_id
-FULL JOIN products p ON p.id = oi.product_id
-FULL JOIN users u ON u.id = o.user_id;
+	oi.product_id AS product
+FROM orders o
+LEFT JOIN order_items oi ON o.id = oi.order_id
+LEFT JOIN products p ON p.id = oi.product_id
+WHERE oi.product_id IS NULL;
 
 /*
 **❓ Ответь на вопросы:**