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Data Flow Diagram Level 1 - Essay Example

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The paper "Data Flow Diagram Level 1" discusses that it is essential to state that the chosen identifier has a data type of ‘Number’, and it is recommended that the value of the identifier should be incremented automatically upon the addition of each record. …

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Subject: Information Technology
Type: Essay
Level: Masters
Pages: 1 (250 words)
Downloads: 5
Author: flegros

Extract of sample "Data Flow Diagram Level 1"

In this case, the identifier is not required to be entered or controlled manually; rather the database itself manages such identifiers (Ramakrishnan, 2002). Two relationships have been added in the above diagrams which were not given in figures 7-20 including one and only one customer can perform zero or many transactions at a time and only one customer could have zero or many coupons at a time. The remaining relationships are the same as described in the given figure. However, the minimum cardinalities have been added i-e zero or one with many entities as shown in the above diagram.

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