The values of one column cannot be greater than another

Question

I am trying to create a table where the values in one column can\'t be greater than the next column over. For example, I am creating the following table.

CREATE          


        

Answer 1

Just change it to a table-level constraint instead of a column constraint.

CREATE TABLE Price (
    PriceID INT PRIMARY KEY IDENTITY (1,1),
    OriginalPrice FLOAT NOT NULL,
    CurrentPrice FLOAT NOT NULL,
    Discount FLOAT,
    ShippingCost FLOAT NOT NULL,
    Tax FLOAT NOT NULL,
    CHECK (CurrentPrice <= OriginalPrice));

You can also add it after, e.g.

ALTER TABLE Price ADD CHECK (CurrentPrice <= OriginalPrice);
--or
ALTER TABLE Price ADD CONSTRAINT CK_Price_Current_vs_Original
    CHECK (CurrentPrice <= OriginalPrice);