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

Answer 1

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