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

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

is probably better, but not faster.

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