Question

This is my tables and structure

Shoutbox

• SID //PK
• Title //Title

shoutbox_follower

• SID
• UID //User ID

Shouts

• SID
• Text //Shouts

I want to get the last 1 (latest) shouts(Shouts.Text) for each Shoutbox, which the user is following

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i tried this but it did not worked

select shoutbox_follower.SID,shoutbox.title, shouts.text from shoutbox_follower, shoutbox, shouts where shoutbox_follower.uid=1;

But i can do the work with multiple query

SELECT SID from shoutBox_Follower where UID=5
SELECT SID,TEXT from Shouts where SID in ($boxList) order by id desc limit 1
SELECT Title from Shoutbox where SID=? limit 1

Answer 1

You can combine the queries, in cases like this:

SELECT SID,
       (select TEXT
       from Shouts
       where Shouts.SID = shoutBox_Follower.SID
       order by Shouts.SID desc limit 1
       ) as shout_text
from shoutBox_Follower
where UID=5

It performs very fast for small numbers of rows (assuming you’ve the needed indexes, of course). Based on your third query, the title can be fetched using a simple inner join.