D.11 RDB$FIELDS

RDB$FIELDS stores definitions of columns and domains, both system and custom. This is where the detailed data attributes are stored for all columns.

Note

The column RDB$FIELDS.RDB$FIELD_NAME links to RDB$RELATION_FIELDS.RDB$FIELD_SOURCE, not to RDB$RELATION_FIELDS.RDB$FIELD_NAME.

Column Name Data Type Description
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 SQL expression specifying the check of the CHECK value in the 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 SQL expression the database server uses for evaluation when accessing a COMPUTED BY column
RDB$COMPUTED_SOURCE BLOB TEXT The original source text of the expression that defines a COMPUTED BY column
RDB$DEFAULT_VALUE BLOB BLR The default value, if any, for the field or domain, in binary language representation (BLR)
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 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$FIELD_SUB_TYPE SMALLINT Specifies the subtype for the BLOB data type: 0 - untyped 1 - text 2 - BLR 3 - access control list 4 - reserved for future use 5 - encoded table metadata description 6 - for storing the details of a cross-database transaction that ends abnormally 7 - external file description 8 - debug information (for PSQL) Specifies for the CHAR data type: 0 - untyped data 1 - fixed binary data Specifies the particular data type for the integer data types (SMALLINT, INTEGER, BIGINT, INT128) and for fixed-point numbers (NUMERIC, DECIMAL): 0 or NULL - the data type matches the value in the RDB$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 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 sequence 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, in order 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