Question

my query is

select m.year_id,Count(*) as Distinctions from NewTestDB.dbo.[Master_MARKS2005] as m
join NewTestDB.dbo.Master_Student as s
on s.Student_id=m.Student_Id
join NewTestDB.dbo.Master_School as sc
on sc.school_id=s.school_code
where sc.SCHOOL_CODE= 'an0001' and m.YEAR_ID between 1 and 8 and m.[NRC_CLASS]='D'
group by m.year_id,

i want out of all year_id’s between 1 to 8 but now i am getting only when m.[NRC_CLASS]=’D’
how to rewrite this query so that i can get count as ‘0’ when no rows in the m.NRC_CLASS column contains ‘D’ value

Answer 1

You should use Left Join to achieve this

Like you can try this

SELECT m.year_id,COUNT(*) AS Distinctions 
       FROM NewTestDB.dbo.[Master_MARKS2005] AS m
LEFT JOIN 
       NewTestDB.dbo.Master_Student AS s
ON 
       s.Student_id=m.Student_Id
JOIN 
       NewTestDB.dbo.Master_School AS sc
ON 
       sc.school_id=s.school_code
WHERE 
       sc.SCHOOL_CODE= 'an0001' 
       AND 
       m.YEAR_ID BETWEEN 1 AND 8 
       AND 
       m.[NRC_CLASS]='D' 
GROUP BY m.year_id,