Assertion: table's constraint | /r/CapableOf | reference column
Facets:
value: in the same table
type: LOCATION
Source sentences:
text: FOREIGN KEY constraints can reference only columns that are PRIMARY KEY or UNIQUE constraints in the referenced table or columns referenced in a UNIQUE INDEX on the referenced table.
text: FOREIGN KEY constraints can reference another column in the same table.
text: FOREIGN KEY constraints can reference only columns in PRIMARY KEY or UNIQUE constraints in the referenced table or in a UNIQUE INDEX on the referenced table.