嵌套在MySQL中的where子句

Question

I have two tables: Event and Story -- the former has info about an event and the latter has the story text of those events.

I can get all the story_id of the events that involve Brazil from Event like so:

SELECT @story_id := `story_id` FROM events
    WHERE actor_id='Brazil';

Then I want to query Story using the story_id I got. How would I do that? Can I nest them somehow?

UPDATE: I ended up storing story_id in a temporary table instead of a variable. (New to MySQL, I have no idea how variable works here...)

CREATE TEMPORARY TABLE IF NOT EXISTS temp_table AS (SELECT story_id FROM events
    WHERE actor_id='Brazil');

Then

SELECT * FROM stories, temp_table
    WHERE stories.StoryID = temp_table.story_id;

I'd appreciate any comment on this solution!

Answer 1

You could do this, with a JOIN :

SELECT @story_id := e.`story_id`, s.* FROM events e
INNER JOIN stories s ON s.StoryId = @story_id
    WHERE e.actor_id='Brazil';

So the reason for the s 's and the e 's are to identify what tables you're selecting from. You could just do FROM events and INNER JOIN stories , however, that's just the syntax I use to avoid typing out long table names. You could just do this:

SELECT @story_id := events.`story_id`, stories.* FROM events
INNER JOIN stories ON stories.StoryId = @story_id
    WHERE events.actor_id='Brazil';

However, as you probably notice, it's longer and not as simple. Though it is easier to understand.