Join one row to multiple rows in another table

Posted by Ghostrider on Stack Overflow See other posts from Stack Overflow or by Ghostrider
Published on 2010-05-23T18:03:09Z Indexed on 2010/05/23 18:10 UTC
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sql

|

mysql

|

database

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join

I have a table to entities (lets call them people) and properties (one person can have an arbitrary number of properties). Ex:

People

Name  Age
--------
Jane  27
Joe   36
Jim   16

Properties

Name   Property
-----------------
Jane   Smart
Jane   Funny
Jane   Good-looking
Joe    Smart
Joe    Workaholic
Jim    Funny
Jim    Young

I would like to write an efficient select that would select people based on age and return all or some of their properties.

Ex: People older than 26
Name Properties
Jane Smart, Funny, Good-looking
Joe Smart, Workaholic

It's also acceptable to return one of the properties and total property count.

The query should be efficient: there are millions of rows in people table, hundreds of thousands of rows in properties table (so most people have no properties). There are hundreds of rows selected at a time.

Is there any way to do it?

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