CK828
发表于 2025-3-21 18:39:59
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Frequency
发表于 2025-3-21 23:24:27
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moribund
发表于 2025-3-22 03:05:44
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除草剂
发表于 2025-3-22 05:03:08
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CYN
发表于 2025-3-22 09:13:50
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
ABIDE
发表于 2025-3-22 16:12:44
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
ABIDE
发表于 2025-3-22 20:53:21
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
裹住
发表于 2025-3-23 00:36:14
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.
transdermal
发表于 2025-3-23 02:05:02
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maintenance
发表于 2025-3-23 06:45:02
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