Domains

You can use domains anywhere corresponding base type can be used:

• Create a column of domain type
• Read/write values from/to domain column
• Call functions with values of domain column
• etc.

• Explicit column type name in or DESCRIBE TABLE
• Input from human-friendly format with
• Loading data from external source in human-friendly format:

Limitations

• Can’t convert index column of base type to domain type via ALTER TABLE.
• Can’t implicitly convert string values into domain values when inserting data from another column or table.
• Domain adds no constrains on stored values.