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

Question

This question already has answers here:
Summing a comma separated column in MySQL 4 (not 5)
(4 answers)
Closed 9 years ago.
id value
1 1,2,3,4
2 2,3,4
So I want to get this result:
id sum
1 10
2 9
Can I do it in SQL(MySQL)?

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
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
the do a just select command in the following way
select id,dbo.GetToalOfCommaSeperatedVal(value) from YOUR_TABLE