操作数类型冲突：时间与int不兼容

Question

In a table, I have a column (AvgWaitTime) which stores data value in seconds (Data Type: float), date wise. I have a function which performs some calculation using AvgWaitTime column and other few columns and returns a value in time format. I would to convert the value returned by the function (time format) into seconds (preferrably decimal, if not then int).

select 
(datepart(HH, dbo.fnGetMonthlyAverageWaitTime(m.RDate) * 60 * 60) +
datepart(mi, dbo.fnGetMonthlyAverageWaitTime(m.RDate) * 60) + 
datepart(s, dbo.fnGetMonthlyAverageWaitTime(m.RDate)))[MonthlyAverageWaitTime]
from TelephonyMTD m

Error: Operand type clash: time is incompatible with int

So, I tried to run this:

 select 
(datepart(HH, GetDate() * 60 * 60) +
datepart(mi, GetDate() * 60) + 
datepart(s, GetDate()))

Now it says, Implicit conversion from data type datetime to int is not allowed. Use the CONVERT function to run this query. Which is true when I looked at the data type conversion chart, I came to know that conversion to int and float is now allowed.

Please advice.

Answer 1

The problem is you are trying to multiply a date/datetime by an integer which doesn't make sense:

GetDate() * 60 * 60

You could simply use DATEDIFF with seconds, to get the value in seconds:

SELECT  DATEDIFF(SECOND, '00:00:00', dbo.fnGetMonthlyAverageWaitTime(m.RDate)) AS MonthlyAverageWaitTime
FROM    TelephonyMTD AS m

QUICK EXAMPLE

SELECT  t.AvgTime, 
        AvgTimeInSeconds = DATEDIFF(SECOND, '00:00:00', t.AvgTime)
FROM    (VALUES
            (CAST('00:01:15' AS TIME)),
            (CAST('05:36:47' AS TIME))
        ) AS t (AvgTime);

Which gives:

+----------+------------------+
|  AvgTime | AvgTimeInSeconds |
+----------+------------------+
| 00:01:15 |        75        |
| 05:36:47 |       20207      |
+----------+------------------+

Answer 2

Open and Close brackets are the one causing issue for the above error: Please try like below

SELECT ( 
( Datepart(HH, Getdate()) * 60 * 60 ) + 
( Datepart(mi, Getdate()) * 60 ) + 
Datepart(s, Getdate()) 
) 

Answer 3

Try to use Below Syntax to convert seconds to day, hour, minute, seconds

DECLARE @sec INT = 86400;

SELECT 
     CAST(@sec /60/60/24 AS VARCHAR(12))  + ' Days,' 
  +  CAST(@sec /60/60 % 24 AS VARCHAR(12))+ ' Hours,'
  +  CAST(@sec /60 % 60 AS VARCHAR(2))    + ' Minutes, ' 
  +  CAST(@sec % 60 AS VARCHAR(2))        + ' Seconds.';