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PostgreSQLでMySQLのAUTO_INCREMENTを使う

Last updated at Posted at 2019-04-09

AUTO_INCREMENT属性とSERIAL型

AUTO_INCREMENT属性はMySQL用なので、PostgreSQLでは使用できません。

PostgreSQLでは、SERIAL型を使います。

MySQLの場合
CREATE TABLE tasks (
    id INT(10) NOT NULL AUTO_INCREMENT,
    name VARCHAR(255) NOT NULL,
    created_at TIMESTAMP,
    updated_at TIMESTAMP,
    PRIMARY KEY (id)
);
PostgreSQLの場合
CREATE TABLE tasks (
    id SERIAL NOT NULL,
    name VARCHAR(255) NOT NULL,
    created_at TIMESTAMP,
    updated_at TIMESTAMP,
    PRIMARY KEY (id)
);

メモ

  • MySQLではAUTO_INCREMENT属性を、PostgreSQLではSERIAL型を使う
  • SERIAL型は1から2,147,483,647の値を取り扱う
  • なお、PostgreSQLではint(10)のように、INT型に桁数の指定はできない
  • PostgreSQLのINT型は-2,147,483,648から2,147,483,647の整数を取り扱う

参考

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