Hi every one!

I an new in sql so please dont explain with the big words.
My main problem is, i have a table that i want to change data types in certain columns.
Here is the code that i have used

USE [ShearAcTraining]
ALTER TABLE Aircraftmodels
ALTER COLUMN @Speed int,
ALTER COLUMN @Costpermile int,
ALTER COLUMN @FuelConsumptio n int,
ALTER COLUMN @NoSeats int,
ALTER...