Assertion: predicate's value | /r/HasProperty | no two rows
Facets:
value: in subquery>
type: LOCATION
Source sentences:
text: If there are no two rows in <table subquery> such that the value of each column in one row is non- NULL and is not distinct from the value of the corresponding column in the other row, then the result of the <unique predicate> is TRUE ; otherwise, the result of the <unique predicate> is FALSE .