An error occurred while saving. Some database objects were not saved.

In SQL 2000, when designing an existing table, an error often occurs, prompting "An error occurred while saving. A blood database object is not saved ",

After some exploration, I finally learned the reason. In fact, it is because of the table created earlier. Suppose there are two columns and both columns have data. when you design the table, an error occurred while saving the column because the new column you just created must have no data at the beginning, however, if you set it to not be empty, isn't it a conflict? So the solution is to set it to allow null, save it, add data to the table, and then design it to not allow null.