Aggregate count of different columns - sql-server

Question

There are two table:
Table a:
id name b_id1 b_id2 b_id3 b_id4
1 a 10 8 null null
2 b 3 4 8 10
3 c 10 5 4 null
Table B
b_id title
3 Value3
4 Value4
5 Value 5
8 Value 8
10 Value
Table A has F.K on b_id1,b_id2,b_id3,b_id4 to table B on b_id cloumn,
We are going to group on Title and count it.
something like following result:
Title Count
Value3 1
Value4 2
Value5 1
Value8 2
Value10 3
Null 3

Answer 1

Full working example:
DECLARE #Table1 TABLE
(
[id] INT
,[name] VARCHAR(1)
,[b_id1] INT
,[b_id2] INT
,[b_id3] INT
,[b_id4] INT
);
DECLARE #Table2 TABLE
(
[b_id] INT
,[title] VARCHAR(7)
);
INSERT INTO #Table1 ([id], [name], [b_id1], [b_id2], [b_id3], [b_id4])
VALUES (1, 'a', 10, 8, NULL, NULL)
,(2, 'b', 3, 4, 8, 10)
,(3, 'c', 10, 5, 4, NULL);
INSERT INTO #Table2 ([b_id], [title])
VALUES (3, 'Value3')
,(4, 'Value4')
,(5, 'Value 5')
,(8, 'Value 8')
,(10, 'Value');
SELECT T2.[title]
,COUNT(*)
FROM
(
SELECT [b_id1]
FROM #Table1
UNION ALL
SELECT [b_id2]
FROM #Table1
UNION ALL
SELECT [b_id3]
FROM #Table1
UNION ALL
SELECT [b_id4]
FROM #Table1
) DS
LEFT JOIN #Table2 T2
ON DS.[b_id1] = T2.[b_id]
GROUP BY T2.[title];

Answer 2

One way would be like below:Demo Here
;with cte
as
(select title,count(b_id) as val from table1 t
join
table2 t2
on t.id=t2.b_id
or
t.b_id1=t2.b_id
or
t.b_id2=t2.b_id
or
t.b_id3=t2.b_id
or
t.b_id4=t2.b_id
group by title
)
select * from cte
union all
select null,sum(case
when b_id1 is null then 1 else 0 end)+
sum(case
when b_id2 is null then 1 else 0 end)
+sum(case
when b_id3 is null then 1 else 0 end)
+sum(case
when b_id4 is null then 1 else 0 end)
from table1
output:
Value 3
Value 5 1
Value 8 2
Value3 2
Value4 2
NULL 3