Wikibase/Schema/wb_terms

The wb terms table stores labels, descriptions and aliases of entities.

Fields

term_row_id

Unique row ID.

term_full_entity_id

The full entity ID of the entity, e. g. "Q42" or "P31".

term_entity_type

Contains a plain text string with one of the following values:

item — means term_full_entity_id refers to an item
property — it refers to a property

term_language

examples: "ab", "ace", "aeb", "aeb-arab", "aeb-latn", "be-x-old", "de", "de-at", "de-ch", "de-formal", "en", "en-ca", "en-gb"
A complete list can be found [where?]

term_type

Contains a plain text string with one of the following values:

label — the main label to be used for representing the described Entity in Wikidata in the specific languages, e.g., Georgia could be an English label. For properties, the label may be referred as the "name", as it is unique for the particular language (according to the Wikibase DataModel).
description — a brief description to clarify the meaning of the label (which may be ambiguous), e.g., a country in the Caucasus could be an English description. The intended use is mainly disambiguation when displaying multiple entities with the same label, for selection. For items (as opposed to properties), the combination of label and description is unique for one particular language, if both label and description are defined (according to the Wikibase DataModel).
alias — Also known as — alternative label in the selected languages, used mainly for searching for items by their name. There may be multiple alias entries per entry_id per language.

More details: Wikibase/DataModel § EntityDescriptions of Items and Properties

term_text

The term_text column stores textual values of labels, descriptions, and aliases. This can be filtered with the use of term_type

term_search_key

The same value as term_text contains, but normalized for search, e.g. all lowercase

Versions

Current as of 14 May 2018

+---------------------+---------------------+------+-----+---------+----------------+
| Field               | Type                | Null | Key | Default | Extra          |
+---------------------+---------------------+------+-----+---------+----------------+
| term_row_id         | bigint(20) unsigned | NO   | PRI | NULL    | auto_increment |
| term_entity_id      | int(10) unsigned    | NO   | MUL | NULL    |                |
| term_full_entity_id | varbinary(32)       | YES  | MUL | NULL    |                |
| term_entity_type    | varbinary(32)       | NO   | MUL | NULL    |                |
| term_language       | varbinary(32)       | NO   | MUL | NULL    |                |
| term_type           | varbinary(32)       | NO   |     | NULL    |                |
| term_text           | varbinary(255)      | NO   | MUL | NULL    |                |
| term_search_key     | varbinary(255)      | NO   | MUL | NULL    |                |
| term_weight         | double unsigned     | NO   |     | 0       |                |
+---------------------+---------------------+------+-----+---------+----------------+

Previously as of Wikibase 0.4 (19 Feb 2013)

+------------------+------------------+------+-----+---------+----------------+
| Field            | Type             | Null | Key | Default | Extra          |
+------------------+------------------+------+-----+---------+----------------+
| term_row_id      | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
| term_entity_id   | int(10) unsigned | NO   | MUL | NULL    |                |
| term_entity_type | varbinary(32)    | NO   | MUL | NULL    |                |
| term_language    | varbinary(32)    | NO   | MUL | NULL    |                |
| term_type        | varbinary(32)    | NO   | MUL | NULL    |                |
| term_text        | varbinary(255)   | NO   | MUL | NULL    |                |
| term_search_key  | varbinary(255)   | NO   | MUL | NULL    |                |
+------------------+------------------+------+-----+---------+----------------+

Restrictions

According to the Wikibase DataModel,