- Number,
Royal House} In reality,
superkeys cannot be
determined simply by
examining one set of
tuples in a relation. A
superkey defines a
functional dependency...
- relation. The
superkeys of a
relation are all the
possible ways we can
identify a row. The
candidate keys are the
minimal subsets of each
superkey and as such...
- bag, by
violating the
basic definition of a set. Both
foreign keys and
superkeys (that
includes candidate keys) can be composite, that is, can be composed...
-
members PREMIUM-B, for
Court 2
bookings made by non-members The table's
superkeys are: S1 = {Court,
Start time} S2 = {Court, End time} S3 = {Rate type,...
- ID,
Supplier ID}}. No
component of that join
dependency is a
superkey (the sole
superkey being the
entire heading), so the
table does not
satisfy the...
-
subset of X,
meaning X → Y is a
trivial functional dependency), X is a
superkey,
every element of Y \ X, the set
difference between Y and X, is a prime...
-
multivalued dependencies X ↠ {\displaystyle \twoheadrightarrow } Y, {X, Y} is a
superkey—that is, the
combination of all
attributes in X and Y is
either a candidate...
-
primary key is a choice[clarification needed] of a
candidate key (a
minimal superkey); any
other candidate key is an
alternate key. In
relational database terms...
- 12
rules CAP
theorem CRUD Null
Candidate key
Foreign key
PACELC theorem Superkey Surrogate key
Unique key
Objects Relation table column row View Transaction...
-
Because a
tuple is unique, its
attributes by
definition constitute a
superkey. All data are
stored and
accessed via relations.
Relations that
store data...
