Access2010 error when running: alter table S alter column AGE SMALLINT;

问题

I only use 'Create' to create a table named 'S'.And 'AGE' is one of its columns.The data type of 'AGE' is INT.

create table S(SNO char(12),SNAME varchar(10),AGE int,SEX char(1),SDEPT varchar(255),primary key(SNO));

When running the following code, appearing messagebox:'Object is invalid or no longer set'. I am new to Access.Please tell me how to fix it.Thanks!

alter table S alter column AGE SMALLINT;

来源：https://stackoverflow.com/questions/61204560/access2010-error-when-running-alter-table-s-alter-column-age-smallint