Question

Is there a way to multiply a column with a predefined number based on another column? There are multiple predefined numbers that are used depending on the value in the column.

Example:

Table

Columns: persons_id,activity,scale 

Values

1,swimming,4  
1,baseball,2  
1,basketball,3  
2,swimming,6  
2,basketball,3

If my predefined numbers are: 6 (swimming), 8 (baseball), 5 (basketball)

The output would look like this

1,swimming,4,24  
1,baseball,2,16  
1,basketball,2,10  
2,swimming,6,36  
2,basketball,3,15

Edit: Thank you everyone for contributing. I ended up using the solution from sgeddes.

Answer 1

Sure, you can use CASE:

SELECT Persons_Id, Activity, Scale, 
   Scale * 
   CASE 
      WHEN Activity = 'swimming' THEN 6
      WHEN Activity = 'baseball' THEN 8
      WHEN Activity = 'basketball' THEN 5
      ELSE 1
   END Total
FROM YourTable

Good luck.