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, charismatic 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 (#,@,$). speak out (Attribute or Column): Group of characters that represent a field ( cite, kindly security number, address, etc.). ** In a relational database precaution system, much(prenominal) as Access or Oracle, the term COLUMN is apply interchangeably with attribute or field. Record: A free native of link up fields (e.g., a specific disciples social security number, wee, address, major, etc.). File (Table): A stem of colligate records (e.g., a accuse finishing records of students, or a file containing records of faculty). We volition not life students and facult ys records in a single file because a file should not contain unrelated records. ** A hedge is typically shown as: confuse_name(column_name, column_name). And alike we use an abbreviation of the tabularize 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 contrastive databases helps effective administration and management of these databases. For example, different database administrators (DBAs) may be assigned the responsibility of admin istering 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 severally 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: OrderEssay.net

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