SQl Query to calculate Total in HH:MM Format

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I have a table(production) which is having a column with name TimeSpent, the datatype of this column is varchar and it stores data in HH:MM format example 10:23,14:59,11:00 etc.I want to write a query in sql which will sum this and give me a total in HH:MM Format only. I tried some thing like this but getting error 'Conversion failed when converting date and/or time from character string.':-

SQL

select CAST
(
(SUM (datepart(hh, convert (varchar, timespent, 108))) +
(sum(datepart(mi, convert (varchar, timespent, 108)))/60) ) AS VARCHAR(2)
)
+ ':' +
CAST
(
sum(datepart(mi, convert (varchar, timespent, 108))) - 60 * (sum(datepart(mi, convert (varchar, timespent, 108)))/60)
 as VARCHAR(2)) from production

Posted 15-Jul-12 21:59pm

Dharmenrda Kumar Singh

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Comments

graciax8 16-Jul-12 4:34am

why did you assign the column as varchar if you'll calculate it later?

Dharmenrda Kumar Singh 16-Jul-12 5:38am

Becoz to maintain the format i used varchar, Previously it is not required and we just want data to display in HH:MM format and after that the requirement changed and asked to me to populate total also of the duration.

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Dharmenrda Kumar Singh · Accepted Answer · 2012-07-15T22:39:00

Query worked for me, I had just updated my table and decreased the size of TimeSpent to Varchar(25) from varchar(60) and it is fixed.

SQL

select CAST
(
(SUM (datepart(hh, convert (varchar, timespent, 108))) +
(sum(datepart(mi, convert (varchar, timespent, 108)))/60) ) AS VARCHAR(2)
)
+ ':' +
CAST
(
sum(datepart(mi, convert (varchar, timespent, 108))) - 60 * (sum(datepart(mi, convert (varchar, timespent, 108)))/60)
 as VARCHAR(2))from production