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 ZONE
35 - 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 ZONE
35 - 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 |