< Extension:WikibaseQualityConstraints 
mysql> describe wbqc_constraints;
+-----------------------+------------------+------+-----+---------+----------------+
| Field                 | Type             | Null | Key | Default | Extra          |
+-----------------------+------------------+------+-----+---------+----------------+
| constraint_id         | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
| constraint_guid       | varbinary(63)    | NO   | UNI | NULL    |                |
| pid                   | int(11)          | NO   | MUL | NULL    |                |
| constraint_type_qid   | varbinary(25)    | NO   |     | NULL    |                |
| constraint_parameters | blob             | YES  |     | NULL    |                |
+-----------------------+------------------+------+-----+---------+----------------+
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