Question

Please see the following example table. I would like to count the 1’s in each row. For the first row N_1 must be 3, for the second 2, then 1, then 0. In the end I would like to incorporate this into a stored procedure with the parameters Table, Columns, Value.

CREATE TABLE Have 
( Col1 INT NOT NULL
, Col2 INT NOT NULL
, Col3 INT NOT NULL
, N_1 INT NULL 
)
INSERT Have (Col1, Col2, Col3)
    VALUES
     (1, 1, 1)
    ,(1, 1, 2)
    ,(1, 2, 2) 
    ,(2, 2, 2)

Answer 1

try this

select Col1, Col2, Col3,
case when col1 = 1 then 1 else 0 end +
case when col2 = 1 then 1 else 0 end +
case when col3 = 1 then 1 else 0 end as N_1
 from Have

or if you need to Update the table

 update Have set N_1 = case when col1 = 1 then 1 else 0 end +
case when col2 = 1 then 1 else 0 end +
case when col3 = 1 then 1 else 0 end

then you can perform

select * from Have