In the columns listview the details of the table columns are specified. Use
the new button to create a new column or use the delete button to remove a
column. When a column is selected the details are copied into the edit line
below the listview. Changes can be made there.
You can change the following column details: column name, data type, size,
precision, scale, nullable, primary key constraint, unique key constraint,
default value and check constraint.
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