Database Concepts

FUNDAMENTAL DATABASE CONCEPTS Data Hierarchy in a Database (from worst to the highest level) Bits: 0/1; basically, the only language understood by a computer; represented by the strength of current, modify polarity, or some other method. Bytes (Characters): Group of bits (normally 7 or 8 bits to a byte) that represent alphanumeric characters (a,b,c1,2,3)and special symbols (#,@,$). spare (Attribute or Column): Group of characters that represent a field ( make up, complaisant security number, address, etc.). ** In a relational database focus system, much(prenominal) as Access or Oracle, the term COLUMN is apply interchangeably with attribute or field. Record: A free topic of link up fields (e.g., a specific students social security number, surname, address, major, etc.). File (Table): A convention of cogitate records (e.g., a consign finishing records of students, or a file containing records of faculty). We volition not life students and fac ultys records in a single file because a file should not contain unrelated records. ** A give in is typically shown as: sidestep_name(column_name, column_name). And alike we use an abbreviation of the postpone name with the column names. For example, in a student table, we whitethorn name students ssn as std_ssn.

This way, we can tell what table a crabbed column appears in. Database: A group of related files (a database of students, a database of administrators, a database of faculty, etc.). Creating different databases helps effective administration and management of these databases. For example, differe nt database administrators (DBAs) may be ass! igned the responsibility of administering and managing different databases. Entity Person, place, thing, event, etc., on which we keep information. For instance, we keep information on students, faculty, courses and classes. For apiece entity in our database, we fix at least one table for it. For example, for faculty, we might take a crap a table that includes information such as their social...If you extremity to get a full essay, order it on our website: OrderCustomPaper.com

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