Table information for 'tap_schema.columns'

General

Table Description: Columns in tables available for ADQL querying.

This table is available for ADQL queries and through the TAP endpoint.

Resource Description: EVN Data Archive's Table Access Protocol (TAP) service with table metadata.

For a list of all services and tables belonging to this table's resource, see Information on resource '__system__/tap'

Citing this table

To cite the table as such, we suggest the following BibTeX entry:

@MISC{vo:tap_schema_colum,
  year=2009,
  title={Untitled Resource},
  author={Mark Kettenis},
  url={https://evn-vo.jive.eu/tableinfo/tap_schema.columns},
  howpublished={{VO} resource provided by the {EVN} Data Archive}
}

Columns

Sorted by DB column index. [Sort alphabetically]

NameTable Head DescriptionUnitUCD
table_name Table Fully qualified table name N/A N/A
column_name Name Column name N/A N/A
description Description Brief description of column N/A N/A
unit Unit Unit in VO standard format N/A N/A
ucd UCD UCD of column if any N/A N/A
utype Utype Utype of column if any N/A N/A
datatype Type ADQL datatype N/A N/A
arraysize Arr. Arraysize in VOTable notation N/A N/A
xtype xtype VOTable extended type information (for special interpretation of data content, e.g., timestamps or points) N/A N/A
"size" Size Legacy length (ignore if you can). N/A N/A
principal Princ? Is column principal? N/A N/A
indexed Indexed? Is there an index on this column? N/A N/A
std Std? Is this a standard column? N/A N/A
sourceRD Sourcerd Id of the originating rd (local information) N/A N/A
column_index Ind. 1-based index of the column in database order. N/A N/A

Columns that are parts of indices are marked like this.

Other

The following services may use the data contained in this table:

VOResource

VO nerds may sometimes need VOResource XML for this table.