Question

I need some help with one SQL statement to update one column (Total) based on two columns (Price, Quantity). I want to update the entire table. This is simply for data analysis and not a long term solution (I would use a trigger instead).

Current Table Data

ID ! Price ! Quantity ! Total

1  ! 2.00  ! 2        ! NULL

2  ! 3.00  ! 1        ! NULL

3  ! 5.00  ! 2        ! NULL

Updated Table Data

Table
ID ! Price ! Quantity ! Total

1  ! 2.00  ! 2        ! 4.00

2  ! 3.00  ! 1        ! 3.00

3  ! 5.00  ! 2        ! 10.00

My crappy SQL obviously doesn’t work

UPDATE Inventory
SET Total = (Price * Quantity)

This won’t work as I need to update the entire table. I guess I would need a sub-query ??

Any help would be appreciated. Thanks

Answer 1

What you posted seems fine to me.

UPDATE inventory SET total = (price * quantity)

will update the whole table row by row.