The Value tab of the Column property sheet has the following components:
No default or computed value Select this option if the column has no default or computed value.
Default value Select this option if the column has a default value. If the column is based on a domain, this setting inherits the domain's default value (if any), but the value can be overridden for the column. Choosing the Default Value option enables the User-defined and System-defined options.
User-defined Type a custom value (string, number, or other expression) for the default value. If you have based the column on a domain, you can retain the domain's default value (if any) or override it for the column.
Literal string Specify whether or not the default value for the column should be treated as a literal string. This option is selected by default for character columns and domains with a character base type. When you select this option, the default text does not need to be enclosed in single quotes, and you do not need to escape embedded single quotes or backslashes in the string.When you clear this option, the automatic quoting and escaping behavior is turned off and the specified default value text is passed as is to the server.
System-defined Select a pre-defined value (for example, current date) for the default value. You must select a value from the dropdown list. If you have based the column on a domain, you can retain the domain's default value (if any) or override it for the column.
Partition size When you select global autoincrement for the system-defined value, you can also supply a partition size.
Global autoincrement assigns each new row a value of one greater than the previous highest value in the column. The partition size restricts the maximum value that global autoincrement can use. You can enter any positive integer for the partition size. Generally, you should select a value so that the supply of numbers is rarely, if ever, exhausted.
Computed value Select this option to define a computed value for the column. A computed column derives its values from calculations of values in other columns. Type an expression in the text box to describe the relationship between the other columns and the value that appears in the computed column.
For more information about computed values, see: