(TYPE ORACLE_LOADER DEFAULT DIRECTORY data_dir ACCESS PARAMETERS (id CHAR(5), emp_dob CHAR(20), emp_lname CHAR(30),Įmp_fname CHAR(30),emp_start_date DATE) ORGANIZATION EXTERNAL LOCATION - The file name in the first two data source types or URI in the Hadoop data source (not in use with hive data source). ORACLE_HIVE - Extracts data stored in Apache HIVE.ĭEFAULT DIRECTORY - In database definition for the directory path.ĪCCESS PARAMETER - Defines the DELIMITER character and the query fields. ORACLE_HDFS - Extracts data stored in a Hadoop Distributed File System (HDFS). Once the dump file is created, it can be read any number of times, but it can’t be modified (that is, no DML operations can be performed). You can write dump files only as part of creating an external table with the CREATE TABLE AS SELECT statement. ORACLE_DATAPUMP -The data must be sourced from binary dump files. ORACLE_LOADER - The data must be sourced from text data files. Specify the TYPE to let the database choose the right driver for the data source, the options are: SELECT * FROM EXTERNAL ((i NUMBER, d DATE)įIELDS TERMINATED BY '|') LOCATION ('test.csv') REJECT LIMIT UNLIMITED) tst_external ĬREATE TABLE with ORGANIZATION EXTERNAL to identify it as an external table. Oracle 18c adds support for inline external tables, which is a way to get data from external source in a SQL query without having to define and create external table first. The Oracle external tables feature allows you to create a table in your database that reads data from a source located outside your database (externally).īeginning with Oracle 12.2, the external table can be partitioned, providing all the benefits of a regular partitioned table. PostgreSQL doesn’t support external tables.
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