Adding to a Value

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kikeman

Hi,

I have a column "Hrs" that is a type double in a table "Orders"

I would like to update the value of "Hrs" adding more hours.

"Order" "Hrs"
A3F4TR 5.5

I have to add 2.5 hrs to that order:

"Order" "Hrs"
A3F4TR 8.0

What dould be the UPDATE command for this scenario?

Thanks,
Enrique.
 
kikeman said:
Hi,

I have a column "Hrs" that is a type double in a table "Orders"

I would like to update the value of "Hrs" adding more hours.

"Order" "Hrs"
A3F4TR 5.5

I have to add 2.5 hrs to that order:

"Order" "Hrs"
A3F4TR 8.0

What dould be the UPDATE command for this scenario?
Click to expand...


The SQL for an update would be:

UPDATE Orders SET Hrs = Hrs + 2.5
WHERE Orders.Order = 'A3F4TR'

If you wanted to do this for all records in the table, you would just leave
off the WHERE clause.
 
Use of the Double data type allows for VERY large numbers ("billions and
billions"), with EXTREME precision (?14 decimal places). I am somewhat
puzzled by your use of this data type for something I believe to represent
hours.

Are you expecting to have billions of hours, or to be able to measure hours
to 14 decimal places?

If not, consider using a different data type ... "Currency" comes to mind
(and no, it isn't only for currency -- it offers no more than four decimal
places and is more accurate for doing math. "Double" uses binary
representation, so there will be binary 'rounding' errors.)

Good luck!

Regards

Jeff Boyce
Microsoft Access MVP

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