Using SQL to search for a set in a one-to-many relationship

select r.roleid
from role r
where not exists (select * from role_permissions rp where rp.roleid = r.roleid and rp.permissionid not in (1,2,3,4)) -- id of permissions
   and (select count(*) from role_permissions rp where rp.roleid = r.roleid) = 4 -- number of permissions

SELECT roleid FROM role_permission t1
WHERE NOT EXISTS (
(SELECT permissionid FROM role_permission t2 WHERE t2.roleid = t1.roleid
 MINUS
 SELECT permissionid FROM role_permission WHERE roleid = 'Admin')
UNION
(SELECT permissionid FROM role_permission t2 WHERE roleid = 'Admin'
 MINUS
 SELECT permissionid FROM role_permsission t2 WHERE t2.roleid = t1.roleid)
)

CREATE PROC get_roles_for_permissions (@list nvarchar(max)) -- @list is a comma separated list of your permission ids
AS
SET NOCOUNT ON

BEGIN

DECLARE     @index INT, @start_index INT, @id INT
DECLARE     @permission_ids TABLE (id INT)

    SELECT @index = 1
    SELECT @start_index = 1
    WHILE @index <= DATALENGTH(@list)
    BEGIN

        IF SUBSTRING(@list,@index,1) = ','
        BEGIN
                SELECT @id = CAST(SUBSTRING(@list, @start_index, @index - @start_index ) AS INT)
                INSERT INTO @permission_ids ([id]) VALUES (@id)
                SELECT @start_index = @index + 1
        END
        SELECT @index  = @index + 1
    END
    SELECT @id = CAST(SUBSTRING(@list, @start_index, @index - @start_index ) AS INT)
    INSERT INTO @permission_ids ([id]) VALUES (@id)

SELECT
r.roleid
FROM
role r
INNER JOIN
role_permission rp
ON r.roleid = rp.roleid
INNER JOIN
@permission_ids ids
ON
rp.permissionid = ids.id
GROUP BY r.roleid
HAVING(SELECT COUNT(*)
       FROM role_permission
       WHERE roleid = r.roleid) = (SELECT COUNT(*) FROM @permission_ids)

END

CREATE TABLE [dbo].[role](
    [roleid] [int] IDENTITY(1,1) NOT NULL,
    [name] [nvarchar](50)
    )

CREATE TABLE [dbo].[permission](
    [permissionid] [int] IDENTITY(1,1) NOT NULL,
    [name] [nvarchar](50)
    )

CREATE TABLE [dbo].[role_permission](
    [roleid] [int],
    [permissionid] [int]
    )

INSERT INTO role(name) VALUES ('Role1')
INSERT INTO role(name) VALUES ('Role2')
INSERT INTO role(name) VALUES ('Role3')
INSERT INTO role(name) VALUES ('Role4')

INSERT INTO permission(name) VALUES ('Permission1')
INSERT INTO permission(name) VALUES ('Permission2')
INSERT INTO permission(name) VALUES ('Permission3')
INSERT INTO permission(name) VALUES ('Permission4')

INSERT INTO role_permission(roleid, permissionid) VALUES (1, 1)
INSERT INTO role_permission(roleid, permissionid) VALUES (1, 2)
INSERT INTO role_permission(roleid, permissionid) VALUES (1, 3)
INSERT INTO role_permission(roleid, permissionid) VALUES (1, 4)
INSERT INTO role_permission(roleid, permissionid) VALUES (2, 2)
INSERT INTO role_permission(roleid, permissionid) VALUES (2, 3)
INSERT INTO role_permission(roleid, permissionid) VALUES (2, 4)
INSERT INTO role_permission(roleid, permissionid) VALUES (3, 3)
INSERT INTO role_permission(roleid, permissionid) VALUES (3, 4)
INSERT INTO role_permission(roleid, permissionid) VALUES (4, 4)

EXEC get_roles_for_permissions '3,4' -- RETURNS roleid 3

id int(10)
name varchar(45)
value int(10)

Permission:           Role                   Role_Permission
id  name  value       id  name               roleid permissionid
--  ----  -----       --  ----               ------ ------------
1   Read     8         1   Admin                1          1
2   Write   16         2   DataAdmin            1          2
3   Update  32         3   User                 1          3
4   Delete  64                                  1          4
                                                2          1
                                                2          3
                                                2          4

SELECT x.roleid, sum(value) FROM role_permission x
inner join permission p
on x.permissionid = p.id
Group by x.roleid

roleid   sum(value)
------   ----------
    1          120       (the sum of permissions 1+2+3+4 = 120)
    2          104       (the sum of permissions 1+3+4 = 104)

SELECT * FROM role r
WHERE r.rolid = (SELECT x.roledid
                 FROM role_permission
                 WHERE x.permissionid in (1,2,3,4);