From 23d4a215a413e6bc21e22f24476ee4fcd96afc46 Mon Sep 17 00:00:00 2001
From: elena belykh <elena79belykh@gmail.com>
Date: Fri, 9 Jan 2026 00:47:27 +0300
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---
 .../агрегации и группировки/агрегации.sql     |  2 +-
 ebelykh/postgresql/функции/функции.sql        | 20 +++++++++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)
 create mode 100644 ebelykh/postgresql/функции/функции.sql

diff --git a/ebelykh/postgresql/агрегации и группировки/агрегации.sql b/ebelykh/postgresql/агрегации и группировки/агрегации.sql
index 7f7ce9b..7875f0b 100644
--- a/ebelykh/postgresql/агрегации и группировки/агрегации.sql	
+++ b/ebelykh/postgresql/агрегации и группировки/агрегации.sql	
@@ -13,7 +13,7 @@ SELECT customer_id,
 FROM visits v
 LEFT JOIN transactions t
 ON v.visit_id = t.visit_id
-WHERE transaction_id IS NULL
+WHERE t.transaction_id IS NULL
 GROUP BY customer_id;
 
 --Задача 1141 
diff --git a/ebelykh/postgresql/функции/функции.sql b/ebelykh/postgresql/функции/функции.sql
new file mode 100644
index 0000000..21479c7
--- /dev/null
+++ b/ebelykh/postgresql/функции/функции.sql
@@ -0,0 +1,20 @@
+--Задача 1211
+SELECT
+    query_name,
+    ROUND(AVG(rating * 1.0 / position), 2) AS quality,
+    ROUND(AVG(CASE WHEN rating < 3 THEN 1 ELSE 0 END) * 100,2) AS poor_query_percentage
+FROM Queries
+GROUP BY query_name;
+
+--Задача 1193
+SELECT
+    TO_CHAR(trans_date, 'YYYY-MM') AS month,
+    country,
+    COUNT(*) AS trans_count,
+    SUM(CASE WHEN state = 'approved' THEN 1 ELSE 0 END) AS approved_count,
+    SUM(amount) AS trans_total_amount,
+    SUM(CASE WHEN state = 'approved' THEN amount ELSE 0 END) AS approved_total_amount
+FROM Transactions
+GROUP BY
+    TO_CHAR(trans_date, 'YYYY-MM'),
+    country;
\ No newline at end of file