来自两个表的MySQL select语句

Question

A common scenario I imagine, but I can't seem to find the terminology to find this answer...

I have two tables, one referencing the other like so:

topics
------------
title
category_id

categories
------------
category_id
category_title

How would I write a query to select the title and category_title of a topic, instead of the id?

Answer 1

How about something like

SELECT  title, 
        category_title
FROM    topics t inner join
        categories c    ON t.category_id = c.category_id

Have a look at JOIN Syntax

Answer 2

您正在寻找的术语称为联接。

select title,category_title from topics,categories where title.category_id = categories.category_id;

Answer 3

试试这个查询

select t.title, c.category_title from topic t, categories c where t.category_id = c.category_id;