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A Novel Data Hiding Method for Two-Color Images by Pan, Wu

By Pan, Wu

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A homogeneous DDBMS has multiple data collections; it integrates multiple data resources. Some of the most venerable systems fall into this class. They can be further divided into classes depending on whether or not they are autonomous. We look at autonomy in more detail later on, but in the meantime we will use this term to indicate a declared aim of the systems designers to give the local systems control of their own destinies. A homogeneous DDB resembles a centralized DB, but instead of storing all the data at one site, the data is distributed across a number of sites in a network.

Ensuring the integrity of the DB is mainly concerned with making sure that the DB obeys the rules of the outside world it is modelling. This is a complex issue and will be discussed in more detail in Chapter 8. An integral part of the relational approach is the relational algebra, which consists of two groups of operators, enabling users to operate on an entire relation. 2 The LABREQ relation. 90 Dr Dr Dr Dr Keogh Keogh Smith Mayhew Overview of Databases and Computer Networks languages which operate on the database one record at a time.

B) Elimination of transitive dependency by splitting. theory of dependencies. A good introduction can be found in an early paper by Beeri et al. (1978). 7 Query languages Most DBMSs offer users a variety of interfaces through which they can store, retrieve and update data in the DB. In addition, they provide a facility through a data definition language (DDL) to describe the data that is to be stored in the DB. From the point of view of this book, it is the former class of languages, namely the query languages, which are of most importance.

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