Each row in the SYSUSERTYPE system view holds a description of a user-defined data type. The underlying system table for this view is ISYSUSERTYPE.
| Column name | Column type | Description |
|---|---|---|
| type_id | SMALLINT | A unique identifying number for the user-defined data type. |
| creator | UNSIGNED INT | The user number of the owner of the data type. |
| domain_id | SMALLINT | The data type on which this user defined data type is based, indicated by a data type number listed in the SYSDOMAIN system view. |
| nulls | CHAR(1) | Whether the user-defined data type allows nulls. Possible values are Y, N, or U. A value of U indicates that nullability is unspecified. |
| width | UNSIGNED INT | The length of a string column, the precision of a numeric column, or the number of bytes of storage for any other data type. |
| scale | SMALLINT | The number of digits after the decimal point for numeric data type columns, and zero for all other data types. |
| type_name | CHAR(128) | The name for the data type. |
| "default" | LONG VARCHAR | The default value for the data type. |
| "check" | LONG VARCHAR | The CHECK condition for the data type. |
PRIMARY KEY (type_id)
FOREIGN KEY (creator) references SYS.ISYSUSER (user_id)
FOREIGN KEY (domain_id) references SYS.ISYSDOMAIN (domain_id)
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