Oracle winter time change

ALTER SESSION SET NLS_LANGUAGE=english; -- First day of week
SELECT 
	NEXT_DAY(LAST_DAY(TO_DATE(TO_CHAR('01/10/' -- Last Sunday of October 02:00
        || (EXTRACT(YEAR FROM SYSDATE)-5 + level) || '02:00:00'), 
           'DD/MM/YYYY HH24:MI:SS')) - INTERVAL '7' DAY, 'SUNDAY') AS H_WINTER,
	NEXT_DAY(LAST_DAY(TO_DATE(TO_CHAR('01/03/' -- Last Sunday of March 02:00 
		|| (EXTRACT(YEAR FROM SYSDATE)-5 + level) || '02:00:00'),
		'DD/MM/YYYY HH24:MI:SS')) - INTERVAL '7' DAY, 'SUNDAY') AS H_SUMMER
FROM DUAL CONNECT BY level <=10;
-- ⇓ Test it ⇓ (Fiddle source link)

Similar codes

0 vote109 views1 answer
Alter boolean column postgresql
SQL
0 vote119 views1 answer
. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified) (.Net SqlClient Data Provider)
SQL
2 votes156 views1 answer
Search query in mysql
SQL
0 vote79 views1 answer
Delete all rows from table sqlite
SQL
0 vote123 views1 answer
Connexion mysql
SQL
-1 vote153 views1 answer
Search all sql tables for a value
SQL
0 vote156 views1 answer
Insert output identity
SQL
0 vote120 views1 answer
Authentication in sql server
SQL
12 votes110 views5 answers
Sql merge
SQL
0 vote126 views1 answer
ORA-13717
SQL