Excel Tablesprovide a special kind of formula syntax called astructured reference.

For example this formula entered in G5:

will change to:

when the formula is copied to H5.

How can we look a column reference to stop it from changing?

Instead, you must duplicate the column name in another pair of square brackets ([]).

This allows the formula in G5 to be copied to H5 and I5 and keep working correctly.