addSql(<<<'SQL' ALTER TABLE note ADD COLUMN slug VARCHAR(255) NOT NULL SQL); } public function down(Schema $schema): void { // this down() migration is auto-generated, please modify it to your needs $this->addSql(<<<'SQL' CREATE TEMPORARY TABLE __temp__note AS SELECT id, content, published_date FROM note SQL); $this->addSql(<<<'SQL' DROP TABLE note SQL); $this->addSql(<<<'SQL' CREATE TABLE note (id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, content VARCHAR(255) NOT NULL, published_date DATE NOT NULL) SQL); $this->addSql(<<<'SQL' INSERT INTO note (id, content, published_date) SELECT id, content, published_date FROM __temp__note SQL); $this->addSql(<<<'SQL' DROP TABLE __temp__note SQL); } }