Database Concepts

FUNDAMENTAL DATABASE CONCEPTS Data Hierarchy in a Database (from net to the highest level) Bits: 0/1; basically, the only language understood by a computer; represented by the strength of current, magnetize 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 (#,@,$). field of operation (Attribute or Column): Group of characters that represent a field ( concern, loving security number, address, etc.). ** In a relational database direction system, much(prenominal) as Access or Oracle, the term COLUMN is apply interchangeably with attribute or field. Record: A free stem turn of link up fields (e.g., a specific pupils social security number, discern, address, major, etc.). File (Table): A theme of link records (e.g., a lodge 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 submit is typically shown as: put off_name(column_name, column_name). And alike we use an abbreviation of the submit 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 assorted databases helps effective administration and management of these databases. For example, differen t database administrators (DBAs) may be assi! gned 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 for each one 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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