Oracle sql 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

2 votes154 views1 answer
SQLSTATE[HY000] [1049] Unknown database
SQL
4 votes162 views1 answer
SQL find text in SP
SQL
42 votes223 views6 answers
Sql query duplicate rows
SQL
0 vote189 views1 answer
Consulta alias con inner join
SQL
0 vote159 views1 answer
Rollback to name in sql
SQL
0 vote152 views1 answer
Substract variable amount of minutes from timestamp postgresql
SQL
52 votes645 views6 answers
Rename column sql
SQL
6 votes156 views2 answers
Postgresql database url
SQL
0 vote159 views4 answers
Best data type to represent money in mysql
SQL
0 vote148 views1 answer
Drop tables from local database postgres pgadmin
SQL