Physical Modeling › DB2 z/OS Property Editors › Define DB2 z/OS Table Column Properties

Define DB2 z/OS Table Column Properties

In a model based on the DB2 for z/OS target server, you use the DB2 for z/OS tab in the Table Column Editor to manage the data type, null option, and other properties for the selected column.

Note: The options described here are the basic options available for most physical data types. There can be more options available depending on the physical data type you assign to the table column. We recommend that you refer to your DB2 for z/OS documentation for more information about using these properties.

To define DB2 for z/OS table column properties

1. Right-click a column in the Model Explorer and click Properties.

   The DB2 for z/OS Table Column Editor opens.

2. Select the table from the Table drop-down that contains the column that you want to define.
3. Select the column in the Navigation Grid that you want to define.

   Note: Click New on the toolbar to create a column. Use the Enter filter text box to filter a large list of columns to locate the one that you want to define.

4. Click the DB2 for z/OS tab and work with the following options:

   Physical Data type

   Lets you select a data type from the drop-down list to apply to the selected column. If the selected data type requires a value for precision, scale, or both, enter the value inside the data type parentheses. For example, you can select the DECIMAL() data type and specify a precision of 2 and a scale of 10 inside the parentheses to assign the data type DECIMAL(2,10) to the selected column.

   Character Type

   Lets you specify the data subtype for a character column. Select a value from the drop-down list.

   Note: This option is only available if you select either the CHAR, CHAR(), CHARACTER, CHARACTER(), VARCHAR(), or LONG VARCHAR() data type.

   Null Option

   Lets you specify a null option for the selected column.

   Average Width

   Lets you enter an estimated average width for the column if the option is available (not dimmed). You can later use the Volumetrics dialog to calculate table and database size estimates based on these and other values.

   Percent Null

   Lets you enter the estimated percentage of nulls used for that column if the option is available. For example, you can estimate a variable width ADDRESS 2 column assigned a width of 50 characters, to be NULL about 30 percent of the time. Use whole numbers. You can later use the Volumetrics dialog to calculate table and database size estimates based on these and other values.

   Label

   Specifies a description for the column.

   Security Label

   Lets you specify whether the column contains security label values. Select the check box to apply this property.

   Is Implicitly Hidden

   Lets you specify whether the column is visible in the results of SQL statements unless it is explicitly referred to by name.

   Generated

   Lets you specify how a table column generates values when using an expression. Select a value from the drop-down list.

5. Click Close.

   DB2 for z/OS table column properties are defined and the DB2 for z/OS Table Column Editor closes.