MySQL query to count non-null values in a single row

Question

I\'m trying to put together a MYSQL query that will count the number of Non-Null (or better yet, non-zero) values in select fields in a single row and then sort from lowest to h

Answer 1

try This:

Select id, Count1, Count2, Count3, Count4
From
    (Select 
        Sum(Case When IsNull(Score_1,0) = 0 Then 1 Else 0 End) Count1,
        Sum(Case When IsNull(Score_2,0) = 0 Then 1 Else 0 End) Count2,
        Sum(Case When IsNull(Score_3,0) = 0 Then 1 Else 0 End) Count3,
        Sum(Case When IsNull(Score_4,0) = 0 Then 1 Else 0 End) Count4
    From Table
    Group By Id) Z  -- This column (Id) better not be the PK for this table!!!
Order By Count1 + Count2 + Count3 + Count4