用 SELECT 插入

本教程将介绍用 SELECT 插入的处理方法，这篇教程是从别的地方看到的，然后加了一些国外程序员的疑问与解答，希望能对你有所帮助，好了，下面开始学习吧。

问题描述

I have a query that inserts using a SELECT statement:

INSERT INTO courses (name, location, gid) 
SELECT name, location, gid 
FROM courses 
WHERE cid = $cid

Is it possible to only select "name, location" for the insert, and set gid to something else in the query?

解决方案

Yes, absolutely, but check your syntax.

INSERT INTO courses (name, location, gid)
SELECT name, location, 1
FROMcourses
WHERE  cid = 2

You can put a constant of the same type as gid in its place, not just 1, of course. And, I just made up the cid value.

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