RDB$TYPES

RDB$TYPES records enumerated data types and alias names for InterBase character sets and collation orders.

RDB$TYPES
Column name	Data Type	Length	Description
`RDB$FIELD_NAME`	`CHAR`	67	Column for which the enumerated data type is being defined.
`RDB$TYPE`	`SMALLINT`		Identifies the internal number that represents the column specified above; type codes (same as `RDB$DEPENDENT_TYPES`): 0 - table 1 - view 2 - trigger 3 - computed_field 4 - validation 5 - procedure 6 - expression index 7 - exception 8 - user 9 - field 10 - index 11 - generator 12 - user group 13 - role 14 - udf 15 - encryption 16 - subscription All other values are reserved for future use.
`RDB$TYPE_NAME`	`CHAR`	67	Text that corresponds to the internal number.
`RDB$DESCRIPTION`	`BLOB`		Subtype Text: Contains a user-written description of the enumerated data type being defined.
`RDB$SYSTEM_FLAG`	`SMALLINT`		Indicates whether the data type is: User-defined (value of 0) System-defined (value greater than 0)