referential constraint
The requirement that nonnull values of a designated foreign key are valid only if they equal values of the primary key of a designated table. The relationship between the primary key in the parent table and a foreign key in a dependent table is used to establish referential integrity in a database. A referential constraint is always assigned a name to distinguish it from other constraints.
Tip: For faster searching, add an asterisk to the end of your partial query. Example: cert*