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SQLize.online is a free online SQL environment for quickly running, experimenting with and sharing code.
You can run your SQL code on top of the most popular RDBMS including MySQL, MariaDB, SQLite, PostgreSQL, Oracle and Microsoft SQL Server.
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CREATE TABLE `catalog_national_finals` ( `id` int primary key auto_increment, `year` int, `title` varchar(64) ); INSERT INTO `catalog_national_finals` (`year`, `title`) VALUES (2021, 'Bla-bla-bla'), (2021, 'Tra-la-la'); CREATE TABLE `voting_data_national_finals` ( `id` int primary key auto_increment, `id_participant` int, `id_user` int, `vote` int ); INSERT INTO `voting_data_national_finals` (`id_participant`, `id_user`, `vote`) VALUES (2, 23, 7); SELECT * FROM `catalog_national_finals` as A LEFT JOIN `voting_data_national_finals` as B ON (A.id = B.id_participant) WHERE A.year = 2021 AND (B.id_user = 23 OR B.id_user IS NULL)
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