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SQL programmingYou can use the HCL OneDB™ implementation of the SQL language to develop applications for HCL OneDB™ database servers.
Guide to SQL: SyntaxThe HCL OneDB™ Guide to SQL: Syntax describes the syntax of the statements, data types, expressions, operators, and built-in functions of the HCL OneDB™ dialect of the SQL language.
SQL statementsThis chapter describes the syntax and semantics of SQL statements that are recognized by HCL OneDB™.
CREATE EXTERNAL TABLE StatementUse the CREATE EXTERNAL TABLE statement to define an external source that is not part of your database to load and unload data for your database.
External Table Examples The examples in this section illustrate different ways to load and unload data using external tables.
Loading Data from External Tables into HCL OneDB™To load data, you define the external data as an external table and then insert the data into the database.
Loading Data Warehousing TablesYou can use external tables to load very large tables for data warehousing applications.
Loading Initially

Loading Initially

About this task

The following scenario creates and loads a data warehouse table with external data.

To load a table initially

Create the table as type RAW to take advantage of light appends and to avoid the overhead of logging during the load.
```
CREATE RAW TABLE tab1 ...
```
Describe the external data file to the database server with the CREATE EXTERNAL TABLE statement, specifying the EXPRESS statement in the USING clause.
Load the table.
```
INSERT INTO tab1 SELECT * FROM ext_tab
```
The table loads quickly, and the operation uses very little log space.
Verify the integrity of the data.
Create indexes on the table so that queries run more quickly.
Perform a level-0 backup so that you can restore the table later, if necessary. You do not need to perform this level-0 backup if it would be just as easy to reload the table from the original source in the case of a problem.