CODEWITHSUNDEEP
sqlmysqlgreatest-n-per-group
user281867
user281867

Reputation: 587

mySQL Returning the top 5 of each category

I want to be able to return 5 menuitem per menu. I've tried this several script but had no luck. here are the tables

menus
-------
menuid int()
profileName varchar(35)

menuitems
-----------
itemid int()
name varchar(40)

Here what I have now. I'm getting the error message with the script below. Error: Subquery returns more then 1 row.

SELECT m.profilename, name
FROM menus m 
WHERE (SELECT name
        from menuitems s
        where m.menuid = s.menuid
        limit 5)

Any suggestion is great appreciated.

Upvotes: 5

Views: 3757

Answers (2)

RichardTheKiwi
RichardTheKiwi

Reputation: 107696

You have to use side effecting variables for this

SELECT profilename, name
FROM
(
    SELECT m.profilename, s.name,
        @r:=case when @g=m.profilename then @r+1 else 1 end r,
        @g:=m.profilename
    FROM (select @g:=null,@r:=0) n
    cross join menus m 
    left join menuitems s on m.menuid = s.menuid
) X
WHERE r <= 5

Upvotes: 13

Matthew Cook
Matthew Cook

Reputation: 178

SELECT TOP 5 m.profilename, s.name
FROM menus m INNER JOIN menuitems s ON m.menuID = s.menuid

Upvotes: -3

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