Manual:Slots table

The slots table represent an n:m relation between revisions and content objects. A content object can have a specific "role" in one or more revisions. Each revision can have multiple content objects, each having a different role.

The table was introduced in MediaWiki 1.31 as part of the project; see  for details. During migration from older versions, the table is populated by (run automatically by the upgrade script).

slot_revision_id
Reference to or. slot_revision_id and slot_role_id together comprise the primary key.

slot_role_id
Reference to

slot_content_id
Reference to

slot_origin
The of the revision that originated the slot's content. To find revisions that changed slots, look for slot_origin = slot_revision_id.

Schema
+--+--+--+-+-+---+ +--+--+--+-+-+---+ +--+--+--+-+-+---+
 * Field           | Type                 | Null | Key | Default | Extra |
 * slot_revision_id | bigint(20) unsigned | NO   | PRI | NULL    |       |
 * slot_role_id    | smallint(5) unsigned | NO   | PRI | NULL    |       |
 * slot_content_id | bigint(20) unsigned  | NO   |     | NULL    |       |
 * slot_origin     | bigint(20) unsigned  | NO   |     | NULL    |       |

Indexes
 +---++---+--+--+---+-+--++--++-+---+ +---++---+--+--+---+-+--++--++-+---+ +---++---+--+--+---+-+--++--++-+---+
 * Table | Non_unique | Key_name                 | Seq_in_index | Column_name      | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
 * slots |         0 | PRIMARY                   |            1 | slot_revision_id | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
 * slots |         0 | PRIMARY                   |            2 | slot_role_id     | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
 * slots |         1 | slot_revision_origin_role |            1 | slot_revision_id | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
 * slots |         1 | slot_revision_origin_role |            2 | slot_origin      | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
 * slots |         1 | slot_revision_origin_role |            3 | slot_role_id     | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |