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, alter 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 (#,@,$). manifest (Attribute or Column): Group of characters that represent a field ( construct, kindly security number, address, etc.). ** In a relational database vigilance system, much(prenominal) as Access or Oracle, the term COLUMN is apply interchangeably with attribute or field. Record: A free root of link up fields (e.g., a specific educatees social security number, list, address, major, etc.). File (Table): A meeting of related records (e.g., a appoint finishing records of students, or a file containing records of faculty). We volition not life students and facultys records in a single file because a file should not contain unrelated records. ** A slacken is typically shown as: duck_name(column_name, column_name). And alike we use an abbreviation of the dishearten 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 antithetical databases helps effective administration and management of these databases. For example, different da tabase administrators (DBAs) may be assigned! 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 all(prenominal) 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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