SQL: float number to hours format

Is there a easy way to format a float number in hours in Ms SQL server 2008?

Examples:

• 1.5 -> 01:30
• 9.8 -开发者_Python百科> 09:48
• 35.25 -> 35:15

Thanks a lot.

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DECLARE @input float = 1.5;

DECLARE @hour int = FLOOR(@input);
DECLARE @minutes int = (SELECT (@input - FLOOR(@input)) * 60);

SELECT RIGHT('00' + CONVERT(varchar(2), @hour), 2) + ':' + RIGHT('00' + CONVERT(varchar(2), @minutes), 2);

SELECT SUBSTRING(CONVERT(NVARCHAR, DATEADD(MINUTE, 1.5*60, ''), 108), 1, 5)

This works by:

• starting from the "zero" date

• adding 1.5 x 60 minutes (i.e. 1.5 hours)

• formatting the result as a time, hh:mm:ss (i.e. format "108")

• trimming off the seconds part

It is necessary to use 1.5 x 60 minutes instead of 1.5 hours as the DATEADD function truncates the offset to the nearest integer. If you want high-resolution offsets, you can use SECOND instead, suitable scaled (e.g. hours * 60 * 60).

Sure. Easy, but not exactly...straightforward:

declare @hours float 
set     @hours = -9.8

select substring('-  ',2+convert(int,sign(@hours)),1)                                        -- sign
     + right('00' + convert(varchar,                       floor(abs(@hours)))         , 2 ) -- hours component
     + ':'                                                                                   -- delimiter
     + right('00' + convert(varchar,round( 60*(abs(@hours)-floor(abs(@hours))) , 0 ) ) , 2 ) -- minutes

Another option that will give the correct result. You might need to tweak it to round minutes and to ensure that both fields are 2 digits wide.

declare @hours float 
set     @hours = -9.8

select       convert(varchar, datediff(minute,dateadd(minute,@hours*60,convert(datetime,'')),'') / 60 )
     + ':' + convert(varchar, datediff(minute,dateadd(minute,@hours*60,convert(datetime,'')),'') % 60 ) 

WITH m AS
  SELECT Minutes = CAST(@hours * 60 AS int)
)
SELECT CAST(Minutes / 60 AS varchar) + ':' + RIGHT(100 + Minutes % 60, 2)
FROM m

select dateadd(MINUTE, cast((8.18 % 1) * 60 as int), dateadd(hour, cast(8.18 as int), convert(varchar(10), getdate(), 10)))