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Chapter A: Network Model ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Basic Concepts ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Data-Structure Diagrams ,[object Object],[object Object],[object Object],[object Object],[object Object]

Data-Structure Diagrams (Cont.) ,[object Object]

General Relationships ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Network Representation of Ternary Relationship

The DBTG CODASYL Model ,[object Object],[object Object]

DBTG Sets ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Repeating Groups ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Repeating Groups (Cont.) ,[object Object]

DBTG Data-Retrieval Facility ,[object Object],[object Object],[object Object]

DBTG Variables ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example Program Work Area ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The Find and Get Commands ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Access of Individual Records ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Access of Records Within a Set ,[object Object],[object Object],[object Object],[object Object],[object Object]

Predicates ,[object Object],[object Object],[object Object],[object Object]

Example DBTG Query ,[object Object]

DBTG Update Facility ,[object Object],[object Object],[object Object],[object Object],[object Object]

DBTG Update Facility (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object]

DBTG Update Facility (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

DBTG Set-Processing Facility ,[object Object],[object Object],[object Object],[object Object],[object Object]

Example disconnect Query ,[object Object],[object Object]

DBTG Set-Processing Facility (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Example reconnect Query ,[object Object]

Set Insertion Example ,[object Object],[object Object],[object Object]

DBTG Set-Processing Facility (Cont.) ,[object Object],[object Object],[object Object],[object Object]

Set Ordering ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Set ordering is specified by a programmer when the set is defined:

Set Ordering (Cont.) ,[object Object],[object Object],[object Object],[object Object]

Set Ordering Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Mapping of Networks to Files ,[object Object],[object Object],[object Object],Figure missing

Mapping of Networks to Files (Cont.) ,[object Object]

Mapping of Networks to Files (Cont.) ,[object Object],[object Object],[object Object]

Mapping of Networks to Files (Cont.) ,[object Object],[object Object]

Mapping of Networks to Files (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Modified Ring Structures ,[object Object]

Physical Placement of Records ,[object Object],[object Object],[object Object],[object Object]

Physical Placement of Records (Cont.) ,[object Object]

Sample Database Corresponding to Diagram of Figure A.3b

Sample Database Corresponding to the Diagram of Figure A.11

Data-Structure and E-R Diagram

Clustered Record Placement for Instance for Figure A.1

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