Question

I need to create a column that will store hours bigger than 24. For example '25:00:00', '129:23:12', etc).

That column will be used to perform calculations between datetime intervals: ‘time’.

I was trying

SELECT  CAST((CAST(CAST(RIGHT('107:37', 6) as datetime) AS FLOAT))/(207.160) AS DATETIME)

if it

below '23:59' instead of '107:37' working fine.

'107:37' give error:

The conversion of a char data type to a datetime data type resulted in
an out-of-range datetime value.

Answer 1

Just store the value as a datetime data type. You can do mathematical calculations on datetime data types, such as +, -, SUM, MIN, MAX, etc, and you can use DateDiff and DateAdd as well. The only tricky bit you’re going to have is in displaying the value as HHHH:mm:ss. You can do that easily enough, though:

DECLARE @datetime DATETIME
SET @datetime = 4.2
SELECT CAST((FLOOR(CAST(@datetime AS FLOAT)) * 24) + DatePart(Hour, @datetime) AS VARCHAR) + 
    ':' + CAST(DatePart(Minute, @datetime) AS VARCHAR)
    + ':' + CAST(DatePart(Second, @datetime) AS VARCHAR)