SQL joins with not exits - sql

Question

SocialStatus
╔═════════════════════════════════════════════════════════════════╗
║ SocialStatusId | SocialTypeId | ResidentId | Details | IsActive ║
╠═════════════════════════════════════════════════════════════════╣
║ 16 | 5 | 2 | Sample | 1 ║
║ 17 | 6 | 4 | kgfhkhgf| 0 ║
║ 18 | 8 | 2 | NULL | 1 ║
║ 19 | 8 | 6 | NULL | 0 ║
║ 21 | 5 | 8 | asdasd | 1 ║
║ 22 | 5 | 3 | adasd | 0 ║
╚═════════════════════════════════════════════════════════════════╝
Resident
╔════════════╦═══════════╦════════════╦══════════╦════════════╦═════════╦══════════╦═══════════════╦═══════════════╦══════════╦══════════╗
║ ResidentId ║ FirstName ║ MiddleName ║ LastName ║ Birthdate ║ Address ║ GenderId ║ ContactNumber ║ IsNonResident ║ IsActive ║ StreetId ║
╠════════════╬═══════════╬════════════╬══════════╬════════════╬═════════╬══════════╬═══════════════╬═══════════════╬══════════╬══════════╣
║ 8 ║ Jonathan ║ Santos ║ Guinto ║ 2016-11-17 ║ Sample ║ 1 ║ 09107435739 ║ 0 ║ 1 ║ NULL ║
╚════════════╩═══════════╩════════════╩══════════╩════════════╩═════════╩══════════╩═══════════════╩═══════════════╩══════════╩══════════╝
SocialType
╔══════════════╦════════════════════════╦═════════════╦══════════╗
║ SocialTypeId ║ SocialName ║ Description ║ IsActive ║
╠══════════════╬════════════════════════╬═════════════╬══════════╣
║ 1 ║ Sample ║ Sample0001 ║ 0 ║
║ 2 ║ Sample2 ║ Sample222 ║ 0 ║
║ 3 ║ Sample3 ║ Sample3123 ║ 0 ║
║ 4 ║ Sample4 ║ Sample4 ║ 0 ║
║ 5 ║ Person with disability ║ Happy ║ 1 ║
║ 6 ║ Señior Citizen ║ Sample ║ 1 ║
║ 7 ║ Unemployed ║ sample ║ 1 ║
║ 8 ║ Indigence ║ sample ║ 1 ║
║ 9 ║ Rowllens ║ asdasdasd ║ 0 ║
║ 10 ║ ║ ║ 0 ║
╚══════════════╩════════════════════════╩═════════════╩══════════╝
From top to buttom is
SocialStatus
Resident
SocialType
what i want to do is to join SocialType and SocialStatus table then filter if Resident has this i.e. Señior Citizen then a bit column assign to true to illustrate more please see output table
My query
SELECT
st.SocialTypeId,
st.SocialName,
CASE WHEN ss.SocialStatusId IS NULL THEN CAST(1 AS bit) ELSE CAST(0 AS bit) END AS IsAssign
FROM dbo.SocialType st
LEFT JOIN dbo.SocialStatus ss ON st.SocialTypeId = ss.SocialTypeId
WHERE ss.IsActive = 1 AND ss.ResidentId = 8
this query return only a single column of SocialType table
output is
╔══════════════╦════════════════════════╦══════════╗
║ SocialTypeId ║ SocialName ║ IsAssign ║
╠══════════════╬════════════════════════╬══════════╣
║ 5 ║ Person with disability ║ 1 ║
╚══════════════╩════════════════════════╩══════════╝
Desire output is something like this
╔══════════════╦════════════════════════╦══════════╗
║ SocialTypeId ║ SocialName ║ IsAssign ║
╠══════════════╬════════════════════════╬══════════╣
║ 5 ║ Person with disability ║ 1 ║
║ 6 ║ Señior Citizen ║ 0 ║
║ 7 ║ Unemployed ║ 0 ║
║ 8 ║ Indigence ║ 0 ║
╚══════════════╩════════════════════════╩══════════╝

Answer 1

According to your Desire result, Try the next:
select
distinct st.SocialTypeId,
SocialName,
CASE
WHEN ss.SocialStatusId IS NULL
THEN CAST(1 AS bit)
ELSE CAST(0 AS bit)
END AS IsAssign
from
SocialType st left outer join SocialStatus ss
on
st.SocialTypeId = ss.SocialTypeId
where
st.IsActive = 1
The Results will be as next:-
Note:
About column "IsAssign", your desire result was 1 for SocialTypeId equlas 5 altought ss.SocialStatusId has number ! , so the result will be 0 according to CASE cluse that you used, is there is somting wrong, kindly revisit your CASE cluse.
UPDATE depends on below comment-
For Filtering ss.residentId =8 Use it in join Conditions rather than Where clause.
as following:-
select
distinct st.SocialTypeId,
SocialName,
CASE
WHEN ss.SocialStatusId IS NOT NULL
THEN CAST(1 AS bit)
ELSE CAST(0 AS bit)
END AS IsAssign
from
SocialType st left outer join SocialStatus ss
on
st.SocialTypeId = ss.SocialTypeId and
ss.residentId =8
where
st.IsActive = 1