Titlebook: Data Structures, Files and Databases; Carl Bamford,Paul Curran Textbook 1991Latest edition Carl Bamford and Paul Curran 1991 Access.data s

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Network Database Models,anguage. During the late 1960s, CODASYL extended its area of interest to include all areas where COBOL might be used. The possibility of COBOL accessing a database led to the formation of a group within CODASYL to define a CODASYL database model. The resulting model, which has been updated at interv

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Relational Database Models,gical model which is further removed from the physical implementation than was the case for the network models examined in the previous chapter. A network database requires the user to navigate around the sets, as was illustrated in figure 11.10 for a sample CODASYL model. Often, in a relational dat

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SQL,numerous database packages, including dBase IV, Informix, Oracle and Ingres as a command language for creating and modifying databases, manipulating data within them and controlling user access. Although there is much similarity between the different implementations, there are a few differences. SQL

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Data Structures I,elationship may be to link the quantity of an item ordered with the corresponding quantity in stock. Another relationship may be to sequence the sales orders according to the required delivery date. Here each sales order is related to the next in sequence.

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