How to sum a comma separated string in SQL? [duplicate]

Answer 1

With great effort, you can do this. Really, though, this is a very, very bad way to store data.

In the spirit that sometimes we have to use data whose format is not under our control:

select id,
       (substring_index(value, ',', 1) +
        substring_index(substring_index(concat(value, ',0'), ',', 2), ',', -1) +
        substring_index(substring_index(concat(value, ',0'), ',', 3), ',', -1) +
        substring_index(substring_index(concat(value, ',0'), ',', 4), ',', -1) +
        substring_index(substring_index(concat(value, ',0'), ',', 5), ',', -1)
       ) as thesum
from t;

The nested called to substring_index() fetch the nth value in the string. The concat(value, ',0') is to handle the case where there are fewer values than expressions. In this case, the nested substring_index() will return the last value for any value of n greater than the number of items in the list. Concatenating 0 to the list ensures that this doesn't affect the sum.

The SQL Fiddle is here.

Answer 2

you can do it more dynamically Creating a function. Please follow the following steps

1. create a function that give the sum of a comma separated value

   CREATE FUNCTION GetToalOfCommaSeperatedVal 
   (
     @commaSeperatedVal varchar(100)
   )
   RETURNS int
   AS
   BEGIN
   
       declare @sum int
       DECLARE @x XML 
       SELECT @x = CAST('<A>'+ REPLACE(@commaSeperatedVal,',','</A><A>')+ '</A>' AS XML)
   
       SELECT @sum=sum(t.value('.', 'int')) 
         FROM @x.nodes('/A') AS x(t)
   
      return @sum
   END
   GO 
   

2. the do a just select command in the following way

   select id,dbo.GetToalOfCommaSeperatedVal(value) from YOUR_TABLE