Manual:Templatelinks table

The templatelinks table contains for each current transclusion the id of the host page, the namespace number of the included page, and its title without namespace.

The target page may or may not exist, and due to renames and deletions may refer to different page records as time goes by.

Despite the name, transclusions are not limited to templates, nor to the MediaWiki parser's transclusion mechanism; various extensions use this table to mark that they have incorporated content from another page. (E.g. 's  and  's  both record the target page in the templatelinks table.)

tl_from
Key to the of the page doing the transclusion.

tl_namespace
Key to of the page being transcluded page. Used in conjunction with tl_title.

tl_title
Key to of the page being transcluded. Used in conjunction with tl_namespace.

tl_from_namespace
of the page doing the transclusion.

tl_target_id
Foreign key to

Schema summary
+---+-+--+-+-+---+ +---+-+--+-+-+---+ +---+-+--+-+-+---+
 * Field            | Type                | Null | Key | Default | Extra |
 * tl_from          | int(10) unsigned    | NO   | PRI | 0       |       |
 * tl_target_id     | bigint(20) unsigned | NO   | PRI | NULL    |       |
 * tl_from_namespace | int(11)            | NO   | MUL | 0       |       |

+---+-+--+-+-+---+ +---+-+--+-+-+---+ +---+-+--+-+-+---+
 * Field            | Type                | Null | Key | Default | Extra |
 * tl_from          | int(10) unsigned    | NO   | PRI | 0       |       |
 * tl_namespace     | int(11)             | NO   | PRI | 0       |       |
 * tl_title         | varbinary(255)      | NO   | PRI |         |       |
 * tl_from_namespace | int(11)            | NO   | MUL | 0       |       |
 * tl_target_id     | bigint(20) unsigned | YES  | MUL | NULL    |       |

+---+--+--+-+-+---+ +---+--+--+-+-+---+ +---+--+--+-+-+---+
 * Field            | Type             | Null | Key | Default | Extra |
 * tl_from          | int(10) unsigned | NO   | PRI | 0       |       |
 * tl_namespace     | int(11)          | NO   | PRI | 0       |       |
 * tl_title         | varbinary(255)   | NO   | PRI |         |       |
 * tl_from_namespace | int(11)         | NO   | MUL | 0       |       |

+---+--+--+-+-+---+ +---+--+--+-+-+---+ +---+--+--+-+-+---+
 * Field            | Type             | Null | Key | Default | Extra |
 * tl_from          | int(10) unsigned | NO   | PRI | 0       |       |
 * tl_from_namespace | int(11)         | NO   | MUL | 0       |       |
 * tl_namespace     | int(11)          | NO   | PRI | 0       |       |
 * tl_title         | varbinary(255)   | NO   | PRI |         |       |

+---+-+--+-+---+---+ +---+-+--+-+---+---+ +---+-+--+-+---+---+
 * Field            | Type                | Null | Key | Default   | Extra |
 * tl_from          | int(10) unsigned    | NO   | PRI | 0         |       |
 * tl_from_namespace | int(11)            | NO   |     | 0         |       |
 * tl_namespace     | int(11)             | NO   | PRI | 0         |       |
 * tl_title         | varchar(255) binary | NO   | PRI | 0         |       |

+---+-+--+-+---+---+ +---+-+--+-+---+---+ +---+-+--+-+---+---+
 * Field        | Type                | Null | Key | Default   | Extra |
 * tl_from      | int(10) unsigned    | NO   | PRI | 0         |       |
 * tl_namespace | int(11)             | NO   | PRI | 0         |       |
 * tl_title     | varchar(255) binary | NO   | PRI | 0         |       |

+---+-+--+-+---+---+ +---+-+--+-+---+---+ +---+-+--+-+---+---+
 * Field        | Type                | Null | Key | Default   | Extra |
 * tl_from      | int(8) unsigned     | NO   | PRI | 0         |       |
 * tl_namespace | int(8)              | NO   | PRI | 0         |       |
 * tl_title     | varchar(255) binary | NO   | PRI | 0         |       |

Indexes
 +---++--+--+---+---+-+--++--++-+---+ +---++--+--+---+---+-+--++--++-+---+ +---++--+--+---+---+-+--++--++-+---+
 * Table        | Non_unique | Key_name                         | Seq_in_index | Column_name       | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
 * templatelinks |         0 | PRIMARY                          |            1 | tl_from           | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
 * templatelinks |         0 | PRIMARY                          |            2 | tl_target_id      | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
 * templatelinks |         1 | tl_target_id                     |            1 | tl_target_id      | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
 * templatelinks |         1 | tl_target_id                     |            2 | tl_from           | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
 * templatelinks |         1 | tl_backlinks_namespace_target_id |            1 | tl_from_namespace | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
 * templatelinks |         1 | tl_backlinks_namespace_target_id |            2 | tl_target_id      | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
 * templatelinks |         1 | tl_backlinks_namespace_target_id |            3 | tl_from           | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |