natural left join

MySQL NATURAL JOIN is such a join that performs the same task as an INNER or LEFT JOIN, in which the ON or USING clause refers to all columns that the tables to be joined have in common. This tutorial explains NATURAL JOINS and uses in MySQL.

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MySQL 為目前最流行的資料庫查詢系統。而 MySQL 主要是以速度、耐用性、易用性為目標,廣泛被企業使用。 支援 MS SQL、Excel、MS Access、XML、CSV 等格式,導入至 MySQL。 ...

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