HOW TO APPLY CASE ON N RESULT code example

Example 1: case statement in sql

Case Statement basically
Like IF - THEN - ELSE statement.

The CASE statement goes through conditions
and returns a value when the
first condition is met and
once a condition is true,
it will stop reading and return the result.
If no conditions are true,
it returns the value in the ELSE clause.

If there is no ELSE part and
no conditions are true, it returns NULL.

FOR EXAMPLE =

CASE
    WHEN condition1 THEN result1
    WHEN condition2 THEN result2
    WHEN conditionN THEN resultN
    ELSE result
END 

-- example:
SELECT 
	CASE
      WHEN (1+6 = 6) THEN 'A'
      WHEN (1+6 = 7) THEN 'B'
      WHEN (1+6 = 8) THEN 'C'
      ELSE 'D'
	END 
FROM DUAL;

Result would be 'B' since it is the first
correct answer

Example 2: store case result sql

declare
    @val int = 0;

select     
    @val = CASE 
        WHEN MONTH([DATE]) = MONTH(getdate()) AND
        YEAR([DATE]) = YEAR(getdate())
        THEN SUM(PROFIT)
        OVER (PARTITION BY [Name], 
            MONTH([DATE]), YEAR([DATE])) 
        ELSE 0 
        END 
FROM table_name
WHERE [Name] = @Name AND
      MONTH([DATE]) = @Month AND
      YEAR([DATE]) = @Year

print @val