| --- |
| title: URL-based Web External Tables |
| --- |
| |
| A URL-based web table accesses data from a web server using the HTTP protocol. Web table data is dynamic; the data is not rescannable. |
| |
| Specify the `LOCATION` of files on a web server using `http://`. The web data file(s) must reside on a web server that HAWQ segment hosts can access. The number of URLs specified corresponds to the minimum number of virtual segments that work in parallel to access the web table. |
| |
| The following sample command defines a web table that gets data from several URLs. |
| |
| ``` sql |
| =# CREATE EXTERNAL WEB TABLE ext_expenses ( |
| name text, date date, amount float4, category text, description text) |
| LOCATION ('http://intranet.company.com/expenses/sales/file.csv', |
| 'http://intranet.company.com/expenses/exec/file.csv', |
| 'http://intranet.company.com/expenses/finance/file.csv', |
| 'http://intranet.company.com/expenses/ops/file.csv', |
| 'http://intranet.company.com/expenses/marketing/file.csv', |
| 'http://intranet.company.com/expenses/eng/file.csv' |
| ) |
| FORMAT 'CSV' ( HEADER ); |
| ``` |
| |
| |
