diff --git a/lab - concat_ws.sql b/lab - concat_ws.sql
index 017cf50..92a8eb6 100644
--- a/lab - concat_ws.sql	
+++ b/lab - concat_ws.sql	
@@ -9,7 +9,7 @@ SELECT csv = CONCAT_WS('","', '"'+name, current_utc_offset, is_currently_dst)+'"
 FROM sys.time_zone_info
 
 --Aggregate concatenation 
-SELECT STRING_AGG(name, ',') FROM sys.time_zone_info
+SELECT STRING_AGG(name, ', ') FROM sys.time_zone_info WHERE NAME LIKE '%central%';
 
 SELECT STRING_AGG(
 		cast(