Principles and Practice of Database Systems |
Common terms and phrases
A-set type access paths ADABAS ANSI application program attribute B-tree binary relation candidate key checkpoint clause Cobol JoD Codasyl model columns component conceptual schema constraints data item data model data structures database key DBCS DBMS defined deleted dependent DEPT distributed databases DM commands DNAME employee entity entry example external schema facilities figure FIND foreign key Fortran global hence host language implementation insertion integrity join key values LOCKR locks log file member record nodal node normal form normalisation operations optimisation option owner record PL/I pointers primary key procedure record keys record name record type relational algebra relational model repeating group resource retrieval run-unit segment type sequential set name set selection set type specified storage record storage schema STUDENT subentry subschema technique third normal form TNAME transaction tuple TUTOR unique update