RDB$FIELDS

RDB$FIELD_NAME

CHAR(63)

The unique name of the domain created by the user or of the domain automatically built for the table column by the system.System-created domain names start with the “RDB$” prefix

RDB$QUERY_NAME

CHAR(63)

Not used

RDB$VALIDATION_BLR

BLOB BLR

The binary language representation (BLR) of the expression of the CHECK constraint of a domain

RDB$VALIDATION_SOURCE

BLOB TEXT

The original source text in the SQL language specifying the check of the CHECK value

RDB$COMPUTED_BLR

BLOB BLR

The binary language representation (BLR) of the expression of a COMPUTED BY column, used to calculate the value of a computed column when it is accessed.

RDB$COMPUTED_SOURCE

BLOB TEXT

The original source text of the expression that defines a COMPUTED BY column

RDB$DEFAULT_VALUE

BLOB BLR

The binary language representation (BLR) of the default value for the field or domain

RDB$DEFAULT_SOURCE

BLOB TEXT

The default value in the source code, as an SQL constant or expression

RDB$FIELD_LENGTH

SMALLINT

Column size in bytes.BOOLEAN occupies 1 byte.FLOAT, DATE, TIME, INTEGER occupy 4 bytes.DOUBLE PRECISION, BIGINT, TIMESTAMP, TIME WITH TIME ZONE, DECFLOAT(16) and BLOB identifiers occupy 8 bytes.TIMESTAMP WITH TIME ZONE occupies 12 bytes.INT128 and DECFLOAT(34) occupy 16 bytes.For the CHAR and VARCHAR data types, the column stores the maximum number of bytes specified when a string domain (column) is defined

RDB$FIELD_SCALE

SMALLINT

The negative number that specifies the scale for DECIMAL and NUMERIC columns — the number of digits after the decimal point

RDB$FIELD_TYPE

SMALLINT

Data type code for the column:

7 - SMALLINT
8 - INTEGER
10 - FLOAT
12 - DATE
13 - TIME
14 - CHAR
16 - BIGINT
23 - BOOLEAN
24 - DECFLOAT(16)
25 - DECFLOAT(34)
26 - INT128
27 - DOUBLE PRECISION
28 - TIME WITH TIME ZONE
29 - TIMESTAMP WITH TIME ZONE35 - TIMESTAMP
37 - VARCHAR
261 - BLOB

Codes for DECIMAL and NUMERIC are the same as for the integer types used for storage.

RDB$FIELD_SUB_TYPE

SMALLINT

Specifies the subtype for the BLOB data type:

0 - untyped (binary)
1 - text
2 - BLR
3 - access control list
4 - reserved for future use
5 - encoded table metadata description
6 - for storing the details of a cross-database transaction that ends abnormally
7 - external file description
8 - debug information (for PSQL)
< 0 - user-defined

Specifies for the CHAR data type:

0 - untyped data
1 - fixed binary data

Specifies the particular data type for the integer data types (SMALLINT, INTEGER, BIGINT, INT128) and for fixed-point numbers (NUMERIC, DECIMAL):

0 or NULL - the data type matches the value in the RDB$FIELD_TYPE field
1 - NUMERIC
2 - DECIMAL

RDB$MISSING_VALUE

BLOB BLR

Not used

RDB$MISSING_SOURCE

BLOB TEXT

Not used

RDB$DESCRIPTION

BLOB TEXT

Any domain (table column) comment text

RDB$SYSTEM_FLAG

SMALLINT

Flag: the value of 1 means the domain is automatically created by the system, the value of 0 means that the domain is defined by the user

RDB$QUERY_HEADER

BLOB TEXT

Not used

RDB$SEGMENT_LENGTH

SMALLINT

Specifies the length of the BLOB buffer in bytes for BLOB columns.Stores NULL for all other data types

RDB$EDIT_STRING

VARCHAR(127)

Not used

RDB$EXTERNAL_LENGTH

SMALLINT

The length of the column in bytes if it belongs to an external table.Always NULL for regular tables

RDB$EXTERNAL_SCALE

SMALLINT

The scale factor of an integer-type field in an external table;represents the power of 10 by which the integer is multiplied

RDB$EXTERNAL_TYPE

SMALLINT

The data type of the field as it is represented in an external table:

7 - SMALLINT
8 - INTEGER
10 - FLOAT
12 - DATE
13 - TIME
14 - CHAR
16 - BIGINT
23 - BOOLEAN
24 - DECFLOAT(16)
25 - DECFLOAT(34)
26 - INT128
27 - DOUBLE PRECISION
28 - TIME WITH TIME ZONE
29 - TIMESTAMP WITH TIME ZONE35 - TIMESTAMP
37 - VARCHAR
261 - BLOB

RDB$DIMENSIONS

SMALLINT

Defines the number of dimensions in an array if the column is defined as an array.Always NULL for columns that are not arrays

RDB$NULL_FLAG

SMALLINT

Specifies whether the column can take an empty value (the field will contain NULL) or not (the field will contain the value of 1)

RDB$CHARACTER_LENGTH

SMALLINT

The length of CHAR or VARCHAR columns in characters (not in bytes)

RDB$COLLATION_ID

SMALLINT

The identifier of the collation for a character column or domain.If it is not defined, the value of the field will be 0

RDB$CHARACTER_SET_ID

SMALLINT

The identifier of the character set for a character column, BLOB TEXT column or domain

RDB$FIELD_PRECISION

SMALLINT

Specifies the total number of digits for the fixed-point numeric data type (DECIMAL and NUMERIC).The value is 0 for the integer data types, NULL is for other data types

RDB$SECURITY_CLASS

CHAR(63)

May reference a security class defined in the table RDB$SECURITY_CLASSES, to apply access control limits to all users of this domain

RDB$OWNER_NAME

CHAR(63)

The username of the user who created the domain originally

RDB$FIELD_NAME

CHAR(63)

The name of the array column.It must be present in the RDB$FIELD_NAME field of the RDB$FIELDS table

RDB$DIMENSION

SMALLINT

Identifies one dimension in the array column.The numbering of dimensions starts with 0

RDB$LOWER_BOUND

INTEGER

The lower bound of this dimension

RDB$UPPER_BOUND

INTEGER

The upper bound of this dimension