The sysxtddesc system catalog table provides a text description of each UDT defined in the database. The sysxtddesc table has the following columns.
| Column | Type | Explanation |
|---|---|---|
| extended_id | INTEGER | Code uniquely identifying the extended data types |
| seqno | SMALLINT | Value to order and identify one line of the description of
the UDT
A new line is created only if the remaining text string is larger than 255 bytes. |
| description | CHAR(256) | Textual description of the extended data type |
A composite index on extended_id and seqno allows duplicate values.
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