Drag a Table Input operator from the Palette to the Design view.
Double-click the Table Input operator.
The property editor opens.
The Details section of the property editor displays the name of the operator and the output schema.
In the Attributes section, you can add or delete attributes for this table input, or move the attributes up or down in order.
In the Data Type column in the Attributes section, select the appropriate data type from the list of data types.
In the Size column, you can specify the size of the data type if, for example, you specify the VARCHAR data type.
Click OK.