Specifying the Data Type and Content Type (Basic Data Mining Tutorial)
Now that you have selected which columns to use for building your structure and training your models, make any necessary changes to the default data and content types that are set by the wizard.
Review and modify content type and data type for each column

On the Specify Columns' Content and Data Type page, click Detect to run an algorithm that determines the default data and content types for each column.

Review the entries in the Content Type and Data Type columns and change them if necessary, to make sure that the settings are the same as those listed in the following table.
Typically, the wizard will detect numbers and assign an appropriate numeric data type, but there are many scenarios where you might want to handle a number as text instead. For example, the GeographyKey should be handled as text, because it would be inappropriate to perform mathematical operations on this identifier.
Column
Content Type
Data Type
Address Line1
Discrete
Text
Address Line2
Discrete
Text
Age
Continuous
Long
Bike Buyer
Discrete
Long
Commute Distance
Discrete
Text
CustomerKey
Key
Long
DateLastPurchase
Continuous
Date
Email Address
Discrete
Text
English Education
Discrete
Text
English Occupation
Discrete
Text
FirstName
Discrete
Text
Gender
Discrete
Text
Geography Key
Discrete
Text
House Owner Flag
Discrete
Text
Last Name
Discrete
Text
Marital Status
Discrete
Text
Number Cars Owned
Discrete
Long
Number Children At Home
Discrete
Long
Region
Discrete
Text
Total Children
Discrete
Long
Yearly Income
Continuous
Double

Click Next.