What is the best way to select multiple rows by ID in sql?

Question

I need to select multiple records

I use

SELECT *
FROM `table`
WHERE `ID` =5623
OR `ID` =5625
OR `ID` =5628
OR `ID` =5621

this query run 4 times in every second whit php

is there a better and faster way for this ?

Answer 1

SELECT *
FROM `table`
where ID in (5263, 5625, 5628, 5621) 

is probably better, but not faster.

Answer 2

SELECT *
FROM `table`
WHERE `ID` IN (5623, 5625, 5628, 5621)

But four times per second is a lot. I would think about another approach that needs less database access.

Answer 3

SELECT *
FROM `table`
WHERE `ID` in (5623, 5625, 5628, 5621)

While Researching this further I came across an interesting blog post that explains how to use a set to get faster SQL performance from In clauses, by creating list of ids into a Common Table Expression (CTE) and then joining on that.

So you could code the PHP equivalent of the following to get maximum performance.

DECLARE  @idList varchar(256) 
SET @idList = '5623, 5625, 5628, 5621'

;with ids (id) as
(
    SELECT value FROM UTILfn_Split(@idList,',')
)

SELECT     t.* 
FROM     table as t
INNER JOIN    ids
ON        t.ID = ids.id

Answer 4

On top of what the people stated (where id in):

1) iF there are a lot of IDs, better to stick them into a temp table and run a join with that temp table

2) Make sure your table has an index on id

3) If the real-timeliness of the data is not critical, put the query results in a cache on the application side

Answer 5

If you do

SELECT *
FROM `table`
WHERE `ID` IN (5623, 5625, 5628, 5621)

You should be fine, as long as the number of ID's don't get too big. I'd suggest you create an index for the ID's, so the query will perform faster.

Also, consider changing your logic, so you don't have to pass that many ID's