From c66d0a58c837aa82b50052f0ba8ffed9aac4d29e Mon Sep 17 00:00:00 2001
From: lub <git@lubiland.de>
Date: Sat, 18 May 2019 12:13:05 +0200
Subject: [PATCH] mysql: add weather-observation-station-4

---
 mysql/weather-observation-station-4/solution.sql | 2 ++
 1 file changed, 2 insertions(+)
 create mode 100644 mysql/weather-observation-station-4/solution.sql

diff --git a/mysql/weather-observation-station-4/solution.sql b/mysql/weather-observation-station-4/solution.sql
new file mode 100644
index 0000000..6bb51e2
--- /dev/null
+++ b/mysql/weather-observation-station-4/solution.sql
@@ -0,0 +1,2 @@
+SELECT COUNT(CITY) - COUNT(DISTINCT CITY)
+FROM STATION
\ No newline at end of file