Glossary

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Glossary
keyworddefinitionpage_link
incomplete specialization(UML) Some members of a superclass might not be members of any subclass.subclass.php
index(SQL) A data structure that the database uses to find records within a table more quickly.views.php
inner join(SQL) Join of two tables with join attributes specified by the programmer.jointypes.php
INSERT INTO(SQL) Statement to add a row of data to a table.tables.php
join (RA)(RA) Formal definition on which the SQL join is based, the pairwise paste of tuples from the relations being joined. Please see full definition on the page.join.php
join (SQL)(SQL) Operation that links two tables, specified in the FROM clause of a SELECT statement. Please see full definition on the page.join.php
join attributesAttributes whose values are matched during the join operation.join.php
join, crossSee cross join.jointypes.php
join, naturalSee natural join.jointypes.php
join, non-equi-See non-equi-join.jointypes.php
join, outerSee outer join.jointypes.php
join, selfSee self join.jointypes.php
junction table(RM,TM) The table created to hold the linking attributes (FKs) from both sides of a many-to-many association.manymany.php
keySee super key.tables.php
key, candidateSee candidate key.keys.php
key, externalSee external key.keys.php
key, foreignSee foreign key.association.php
key, primarySee primary key.tables.php
key, subSee subkey.subkeys.php
key, substituteSee substitute key.keys.php
key, superSee super key.tables.php
key, surrogateSee surrogate key.keys.php
lossless join decompositionDecomposition (breaking apart) of a relation scheme to eliminate a subkey. The original scheme’s information can be recreated with the join in a query.subkeys.php
many-to-many association(UML) An association with maximum multiplicity of *..*manymany.php
materialized view(SQL) A view that creates and stores a result table in advance of being used.views.php
MINUS(RA,SQL) Operation as defined in set theory, returning the difference of the tuples/rows of two relations/tables over the same scheme.setops.php
multiplicity(UML) The minimum and maximum number of individuals of one class that may be associated with a single member of another class.association.php
multivalued attribute(UML) An attribute that contains more than one value from its domain. This is a design error.hobbies.php
named query(SQL) A view.views.php
natural join(SQL) Join of two tables with the intersection of their schemes used as join attributes.jointypes.php
non-equi-join(SQL) Join based on some condition other than equality of the join attributes.jointypes.php
normal form, thirdSee third normal form.subkeys.php
normal forms(RM) A progression of rules for well-structured database design.normalize.php
normalization(RM) Following a set of rules to insure that a database is well designed. See also normal forms.subkeys.php
NULL(SQL) A special constant value, compatible with any data type, that means "this field doesn't have any value assigned to it."phone.php

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