Column Definitions | CREATE FOREIGN TABLE | Teradata Vantage - 17.05 - data_column_definition - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Definition Language Syntax and Examples

Product
Advanced SQL Engine
Teradata Database
Release Number
17.05
Published
January 2021
Content Type
Programming Reference
Publication ID
B035-1144-175K
Language
English (United States)
Specifies the name and data type of a column in the foreign table for Parquet-formatted data. The data_column_definition has the format column_name column_data_type
You cannot specify data column definitions for CSV or JSON formatted external data. Vantage creates the data columns automatically from the information in the data itself or from the column specification in a schema object associated with the CSV data.
  • Define the columns in the same order as they appear in the Parquet file.
  • Use the Vantage column data types that correspond to the Parquet data types listed in the Parquet schema.
Parquet Data Type Corresponding Vantage Data Type Description
UINT_8 SMALLINT Unsigned integer with range 0 to 255.
UINT_16 INTEGER Unsigned integer with range 0 to 65535.
UINT_32 BIGINT Unsigned integer with range 0 to 4,294,967,295.
UINT_64 DECIMAL(20,0) Unsigned integer with range 0 to 18,446,744,073,709,551,615.
INT_8 BYTEINT Signed integer with range -128 to 127.
INT_16 SMALLINT Signed integer with range -32768 to 32767.
INT_32 INTEGER Signed integer with range -2,147,483,648 to 2,147,483,647.
INT_64 BIGINT Signed integer with range -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807.
INT_96 TIMESTAMP(6) Used to represent timestamp. First 8 bytes has number of nanoseconds and next 4 bytes has number of days since Julian day (https://en.wikipedia.org/wiki/Julian_day).
DECIMAL(p,s) DECIMAL(p,s) Decimal where precision is between 1 and 38 (inclusive) and scale is between 0 and 38 (inclusive).
VARBYTE(p+1), where p is the precision of the DECIMAL. Precision and scale is greater than 38.
FLOAT REAL IEEE 32-bit floating point.
DOUBLE REAL IEEE 64-bit floating point.
DATE DATE Number of days from the Unix epoch, 1 January 1970
TIME_MILLIS TIME(3) or TIME(6) Stores time in milliseconds.
TIME_MICROS TIME(6) Stores time in microseconds.
TIMESTAMP_MILLIS TIMESTAMP(3) or TIMESTAMP(6) Stores timestamp in milliseconds.
TIMESTAMP_MICROS TIMESTAMP(6) Stores timestamp in microseconds.
INTERVAL VARCHAR CHARACTER SET UNICODE Stores interval in months, days and milliseconds.
BOOL BYTEINT Boolean (True or False).
STRING VARCHAR or CLOB CHARACTER SET UNICODE Encoded as a UTF8 byte array.
BSON JSON STORAGE FORMAT BSON BSON data.
JSON JSON CHARACTER SET UNICODE JSON data.
STRUCT VARCHAR or CLOB CHARACTER SET UNICODE Group of fixed members.
MAP VARCHAR or CLOB CHARACTER SET UNICODE Maps keys to values.
LIST VARCHAR or CLOB CHARACTER SET UNICODE Contains data that is stored in array.
ENUM VARCHAR or CLOB CHARACTER SET UNICODE Store enumerated values encoded as a UTF8 string.
ARRAY VARCHAR or CLOB CHARACTER SET UNICODE Stored as repeated fields. Can be an array of a single value or multiple values.