Create sqlserver.sql

Author: Deepak-Vohra

sql-queries-12/updating-rows-subquery-referencing-same-table/sqlserver.sql

@@ -0,0 +1,14 @@
+-- Self join
+UPDATE P1
+SET P1.end_date = DATEADD(week, 3, P2.start_date)
+FROM Program AS P1
+JOIN Program AS P2
+ON P1.id = P2.id;
+
+--Subquery within UPDATE ... SET
+UPDATE Program
+SET end_date = (
+    SELECT DATEADD(week, 3, start_date)
+    FROM Program AS Temp
+    WHERE Temp.id = Program.id
+);