Navicat PostgreSQL download for Windows - Navicat PostgreSQL tool working with Setting Field Flags

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Setting Field Flags

Use the Field Flags to set the field properties, described below.

Allow Null

Allow the NULL values for the field.

Note: To set NULL and Empty String as default value, see Setting Other Field Properties.

Primary Key

A Primary Key is a single field or combination of fields that uniquely defines a record. None of the fields that are part of the primary key can contain a null value.