Tag Archives: upsert

PostgreSQL 9.5 釋出,UPSERT!

PostgreSQL 9.5 正式發行,這次新增了大家期待已久的 UPSERT 功能:「PostgreSQL 9.5: UPSERT, Row Level Security, and Big Data」。 SQL:2003 正式定義出 UPSERT,被稱為 Merge,不過看網路上一般還是比較習慣 UPSERT 這個用法: A relational database management system uses SQL MERGE (also called upsert) statements to INSERT new records or UPDATE existing records depending … Continue reading

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PostgreSQL 9.5 的 UPSERT

在「Upsert Lands in PostgreSQL 9.5 – a First Look」這邊提到了 PostgreSQL 9.5 支援的 UPSERT 操作。 UPSERT 的定義是: (computing, database) An operation that inserts rows into a database table if they do not already exist, or updates them if they do. 如果不存在就 … Continue reading

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UPSERT

維基百科對 UPSERT 的說明:(取自「Merge (SQL)」條目) A relational database management system uses SQL MERGE (also called upsert) statements to INSERT new records or UPDATE existing records depending on whether or not a condition matches. 在 MySQL 裡的兩種語法其實就是在實做這個需求: REPLACE INTO ... INSERT INTO … Continue reading

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