Description
The table of columns of the service
Columns
| Name | Type | UCD | Unit | Description | 
|---|---|---|---|---|
| id | integer | 
                         Internal ID of the column  | 
                ||
| table_name | char | 
                         The name of the table of the column  | 
                ||
| column_name | char | 
                         The name of the column  | 
                ||
| datatype | char | 
                         The datatype of the column  | 
                ||
| arraysize | integer | 
                         The size of the column for variable length datatypes  | 
                ||
| size | integer | 
                         The size of the column for variable length datatypes (legacy)  | 
                ||
| description | char | 
                         The description of the column  | 
                ||
| utype | char | 
                         The IVOA UTYPE of the column  | 
                ||
| unit | char | 
                         The Unit of the column  | 
                ||
| ucd | char | 
                         The IVOA UCD of the column  | 
                ||
| principal | boolean | 
                         Designates if the column is considered a core part of the service  | 
                ||
| indexed | boolean | 
                         Designates if the column is indexed  | 
                ||
| std | boolean | 
                         Designates if the column is defined by some standard  | 
                ||
| column_index | integer | 
                         The ordering index of the column  | 
                ||
| table_id | integer | 
                         The foreign key to the table of this column  |