<t>First, make all current NULL values disappear:<br/>
<br/>
UPDATE [Table] SET [Column]=0 WHERE [Column] IS NULL<br/>
<br/>
```<br/>
<br/>
Then, update the table definition to disallow "NULLs":<br/>
<br/>
```<br/>
ALTER TABLE [Table] ALTER COLUMN [Column] INTEGER NOT NULL<br/>
<br/>
```</t>
