Adding Columns to Table
Option Add Column allows you to manually add a column to a table and is available on the Table Details page.
Perform the following steps to add a column to a table.
- On the left sidebar, click TABLES to open the Tables page. 
- On the Tables page, click the name of the table to which a column will be added. This will open its Table Details page. 
- On the Table Details page, under the Columns tab, click Add Column. 
- In the New Column dialog, specify the name of the column. 
- Select the data type for the column from the drop-down list. 
- Optionally, select whether the column will be nullable, a key column or a distribution key column. 
- Optionally, add an attribute to a column. - Click +Add Attribute.
- Select an attribute from the drop-down list.
- Specify or select a value next to the added attribute.
 
- Click Save to add the column to the table. 