Converting Data Types

I have a table with a field of Char(10) Data type

this field contains records of work time Attendance in a decimal format

Ex. I attend today for 8.30 this means eighthours and thirty mintutes

the main problem faced me to make some calculations on those records (sum, subtract, etc)

so I want to convert the data from char type to decimal or real using the next code but it doesn't work

select (cast (satreg, decimal) + cast (satot, decimal)) from timecard

can u please help me in the main issue how to sum char type records or at least how to convert them to decimal

Regards

create table test

(

time char(10)

)

insert into test (time) values ('8.30')

insert into test (time) values ('9.30')

insert into test (time) values ('10.30')

selectconvert(decimal(10,2), time )

fromtest|||

this can help:

it breaks your 8.30 to 8 and 30

SELECT substring(test,0, (patindex('%.%',test))),substring(test,(patindex('%.%',test)+1),len(test)) from test