Download Design of Industrial Information Systems by Thomas Boucher, Ali Yalcin PDF

By Thomas Boucher, Ali Yalcin

Layout of business details structures offers a physique of data acceptable to many points of commercial and production platforms. New software program platforms, similar to firm source making plans, and new applied sciences, comparable to RFID, have made it attainable to combine what have been separate IT databases and operations into one method to achieve the best attainable operational efficiencies. this article presents a historical past in, and an creation to, the correct info applied sciences and indicates how they're used to version and enforce built-in IT platforms.

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Indd 34 9/12/2006 4:12:48 PM The Relational Database Model 35 DBMS. When an index is created, an auxiliary data structure is created that allows the DBMS search algorithm to locate a particular record in a table faster than would be possible without the index. This can be helpful in databases containing many large tables. 2, presented earlier, and establish the tables for VENDOR and PO_DETAIL. 2 SQL: MANAGING THE DATA IN THE DATABASE TABLE Once created, the tables must be populated in order to be useful.

An entity is a person, place, event, concept, or thing about which information is to be kept in the database tables. For example, a particular employee, a specific material, or a manufacturing process plan for a particular component could qualify as entities. A related group of entities, the information about which is maintained in the same table, is called an entity set. Each entity set has unique characteristics, which is the set of information that is kept on that entity set. indd 28 9/12/2006 4:12:48 PM The Relational Database Model 29 These unique characteristics are called attributes.

Such a command defines a main query (query 2) and a subquery (query 1). The main query uses the result of the subquery as a criterion for its command. The syntax is as follows: MAIN QUERY SELECT FROM WHERE SUBQUERY

]); A subquery can also be used to retrieve related data in more than one table. For example, suppose you are interested in seeing the details of all the purchase orders that have been placed with vendor V250.

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