sql server - Converting string with minutes over 60 into time datatype causes an error -

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declare @data table (working_hours nvarchar(10));  datatable  insert @data (working_hours) select '0:10';   insertion values insert @data (working_hours) select '1:90'; insert @data (working_hours) select '0:10'; insert @data (working_hours) select '0:10';  --select working_hours @data;  *this state work*   --select @data lion ; state work  select      convert(int, (datepart(hour, convert(time, q1.working_hours)) * 60) +                   datepart(minute, convert(time, q1.working_hours))) lion  @data q1;

results in conversion error - want convert min nvarchar , convert int calculate sum in sap report

how can denominate work through way..

assuming that's hours , minutes problems data (90 minutes), can without using time -datatype of course doesn't allow kind of time:

select    convert(int, left(working_hours, charindex(':', working_hours)-1)) * 60 +    convert(int, substring(working_hours, charindex(':', working_hours)+1,10))   @data

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