Creating a view allows you to:
- CAST the payload fields to an appropriate data type.
- Rename the header fields using case insensitive naming. Although the example shows the headers in mixed case, you can use whatever case you want in queries.
The examples use a sample river flow data set. To use your own data, replace the table and column names, and authorization object. See Variable Substitutions for Examples for the credentials and location values for the sample data set.
- To run NOS-related commands, log on to the database as a user with the required privileges.
- If it does not exist, create the foreign table or ask your database administrator to create the foreign table called riverflow_csv_pathfilter: See Filtering Using a Column Within the Data Set.
- Create the view on the foreign table:
CREATE VIEW riverflowview_csv AS ( SELECT Flow, GageHeight, Precipitation, Temp, Conductance, Site_no FROM riverflow_csv_pathfilter );
- Query the view:
SELECT TOP 2 * FROM riverflowview_csv;
Your result will be similar to the following:
Flow GageHeight Precipitation Temperature Conductance site_no ------ ---------- ------------- ----------- ----------- -------------- 17500 10.21 .00 11.0 670 9380000 17700 10.25 .00 11.2 671 9380000
Columns with missing attributes return NULLs when the record does not contain the attribute.