How can I structure a query to give me only the rows that match ALL values in a CSV list of IDs in T-SQL

Question

I\'ve created a simple example (hopefully much more fun than my actual data) to better express my question:

CREATE TABLE SUPER_HERO
(   ID INT,
    NAME VAR         


        

Answer 1

This is divided in two parts, the filter, and the rest of the query so it is easy to extend

DECLARE @DELIMITER CHAR = ','
DECLARE @CSV_STRING VARCHAR(20) = '1,3'

SELECT @TOTREQ = COUNT(DISTINCT ITEMS) FROM dbo.Split(@CSV_STRING, @DELIMITER)

SELECT 
     SUPER_HERO_NAME =   SUPER_HERO.NAME
FROM 
    SUPER_HERO INNER JOIN
    (SELECT SUPER_HERO_SKILL.SUPER_HERO_ID
     FROM SUPER_HERO_SKILL     
     LEFT JOIN dbo.Split(@CSV_STRING, @DELIMITER) SPLIT ON SUPER_HERO_SKILL.SKILL_ID = SPLIT.ITEMS
     GROUP BY SUPER_HERO_SKILL.SUPER_HERO_ID
     HAVING COUNT(SPLIT.ITEMS) = @TOTREQ      -- This ensure no mising super-powers
        AND COUNT(*) = @TOTREQ                -- This ensure no extra super-powers  (can be omited of course)
     ) AS FILTER ON     SUPER_HERO.ID = FILTER.SUPER_HERO_ID