PostgreSql 欄位自動累加
serial 和 bigserial 類型不是真正的類型， 只是為在表中設置唯一標識做的概念上的便利．（類似其它一些數據庫中 的 AUTO_INCREMENT 屬性）。 在目前的實現中，下面一句話：
CREATE TABLE tablename ( colname SERIAL );
等價於聲明下面幾句話：
CREATE SEQUENCE tablename_colname_seq;
CREATE TABLE tablename(
colname integer DEFAULT nextval('tablename_colname_seq') NOT NULL
);
這是來自 postgreSql 的說明,所以自動加1的欄位可以用 SERIAL 的類型
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PostgreSql 欄位自動累加 | 豬窩
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