Topic#6: Relational Database Operators 6.1 Significance of Relational Operators • Relational database supports basic database operations in order to provide useful means for retrieving or manipulating data in tables. • Because the relational model has its mathematical basis upon the relational theory (by thinking tables as sets or relations)‚ the supported database operators conform to existing operators in relational algebra. • In fact‚ a relational database software implementation
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Review Questions 6. What is an entity? Something about which we want to store data. 7. What is business logic? The set of rules that govern an organizations processes. 8. What is a relational database? A data base that organizes data into overlapping tables. They follow a set of very specific rules that ensure data contained in the database will be consistent. 9. How do the following terms relate to one another: record‚ table‚ field‚ primary key? Rows are called records
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Relational Databases Lee Rudd Abstract Data for our programs are stored in various formats. The most commonly used format is in the form of a database since databases are not dependent on a single program or hardware platform. These databases are stored in five structures of hierarchical‚ network‚ relational‚ multidimensional‚ and object-oriented. Hierarchical structure organizes data in a one to many relationship. The network goes of the hierarchical structure by organizing data in
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Files and Relational Databases What is a file? • contains groups of records used to provide information for operations‚ planning‚ management and decision making. • can be used for storing data for an indefinite period of time‚ or they can be used to store data temporarily for a specific purpose. FILE TYPES • Master Files -- contain records for a group of entities. The attributes may be updated often‚ but the records themselves are relatively permanent. These files
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constructing of Relational Database using an EER Model 4.1 The steps involved in the design of relational database are 1) Developing the conceptual model – Drawing the ER/ EER diagram 2) Transforming the Conceptual model into a set of relations – relational schema and 3) Normalizing the relations. Once ER / EER model has been developed for the application ‚ ER/ EER diagram can be mapped into a relational model . ER/ EER diagram consists of the following components. 1)
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MGMT 54400 Fall 2013 Relational Schema 1. CUSTOMER (C_Name‚ C_Phone‚ Dr_Lic_No‚ C_Street‚ C_City‚ C_State‚ C_Zip) 2. CAR (Vehicle_ID‚ Lic_Plate_No‚ Make‚ Model‚ Price‚ Mileage‚ Car_Type‚ D_Name) FK D_Name DEALER 3. COMPACT_CAR (C_Vehicle_ID‚ No_of_Doors) FK C_Vehicle_ID CAR 4. LUXURY_CAR (L_Vehicle_ID‚ Headroom‚ Legroom‚ Premium) FK L_Vehicle_ID CAR 5. DEALER (D_Name‚ D_Phone‚ D_Street‚ D_City‚ D_State‚ D_Zip) 6. SERVICE_CO (Co_Name‚ Co_Phone‚ Co_Street‚ Co_City‚ Co_State‚ Co_Zip)
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Tuple Relational Calculus ( TRC ) Introduction Procedural Query language query specification involves giving a step by step process of obtaining the query result e.g.‚ relational algebra usage calls for detailed knowledge of the operators involved difficult for the use of non-experts Declarative Query language query specification involves giving the logical conditions the results are required to satisfy easy for the use of non-experts Prof P Sreenivasa Kumar‚ Department of CS&E‚ IITM. 1 TRC
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ATLANTIC INTERNATIONAL UNIVERSITY A Model Theory for Generic Schema Management Models Kinan M Al Haffar UM4699SIT10550D 07/08/2007 Abstract The core of a model theory for generic schema management is developed. This theory has two distinctive features: it applies to a variety of categories of schemas‚ and it applies to transformations of both the schema structure and its integrity constraints. A subtle problem of schema integration is considered in its general form‚ not bound to any particular
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The history began between Relational Databases and SQL. In 1970‚ Edgar F. Codd wrote the now-famous paper on relational data modeling: "A Relational Model of Data for Large Shared Data Banks." The original relational database language‚ developed by IBM‚ was called SEQUEL (Structured English Query Language) to support its prototype RDBMS (Relational Database Management System) called System/R. The name later was changed from SEQUEL to Structured Query Language. In the beginning Codd started out a
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READ ME FIRST WEEK ONE Introduction This course provides you with an introduction to database architecture and relational databases. The introduction covers the basic concepts of database design and management‚ focusing on the steps that a database designer should follow when creating a database for use with an application‚ addressing the basic tasks encountered by a database administrator‚ and identifying and discussing some of the aspects of ongoing database management.
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