Calculating total of all MM:SS

Yesterday in a forum I found a question asking for a way to calculate the total of MM:SS in SQL Server. More over that column is being maintained as a "Varchar" type!!

Below is the query i suggested as my suggestion. Please note, the below query would work as long as Minutes (MM) is lesser than 60.

--Sample table structure

CREATE TABLE SumTimeTest

(

id varchar(4),

timeValue varchar(5)

)

--Test data

INSERT INTO SumTimeTest VALUES('1','30:50')

INSERT INTO SumTimeTest VALUES('1','30:25')

INSERT INTO SumTimeTest VALUES('2','20:50')

INSERT INTO SumTimeTest VALUES('3','25:20')

INSERT INTO SumTimeTest VALUES('1','35:50')

Solution:

SELECT CONVERT(VARCHAR(10),

DATEADD(ss,SUM(

DATEDIFF(second,0,

DATEADD(DAY,0,CAST('00:' + timevalue AS DATETIME)))),0)

,108) AS [HH:MM:SS]

FROM sumtimetest

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