4.2 The History of Relational Databases

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The diagram in Figure 4.6 shows the evolution of relational databases. Notice on the left how SQL was first devised as being a data access language with the development of System R from IBM, used today as SQL or Structured Query Language.

Figure 4.6: The Evolution of the Relational Databases

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Arrows in Figure 4.6 represent both a flow of development and a flow of people and their skills. Oracle Corporation created Oracle software. Ingres Corporation did not create Oracle Database. However, the skills and personnel were passed between the different database vendor software companies. Ingres Corporation is now defunct and owned by Computer Associates.

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