Update README.md

README.md

@@ -10,6 +10,7 @@ and make some queries. Some examples are below.
 
 ### Most Expensive Non-Free Apps
 
+```SQL
 SELECT
     s.canonical_url,
     s.app_name,
@@ -27,9 +28,11 @@ JOIN currency_rates cr
 GROUP BY s.canonical_url
 ORDER BY usd_price DESC, s.int_app_id ASC
 LIMIT 1000;
+```
 
 ### Most Expensive IAP Products
 
+```SQL
 SELECT
     s.canonical_url,
     s.app_name,
@@ -50,3 +53,4 @@ JOIN currency_rates cr
 GROUP BY s.canonical_url
 ORDER BY usd_price DESC, s.int_app_id ASC
 LIMIT 1000;
+```