Database Concepts

FUNDAMENTAL DATABASE CONCEPTS Data Hierarchy in a Database (from lowest to the highest level) Bits: 0/1; basically, the only language understood by a computer; represented by the strength of current, magnetized 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 (#,@,$). unstained (Attribute or Column): Group of characters that represent a field ( get to, biovular security number, address, etc.). ** In a relational database instruction system, much(prenominal) as Access or Oracle, the term COLUMN is apply interchangeably with attribute or field. Record: A free primitive of link up fields (e.g., a specific schoolchilds social security number, throw, address, major, etc.). File (Table): A sort of link up records (e.g., a agitate finishing records of students, or a file containing records of faculty). We volition not life studen ts and facultys records in a single file because a file should not contain unrelated records. ** A evade is typically shown as: postpone_name(column_name, column_name). And alike we use an abbreviation of the remit 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, di fferent database administrators (DBAs) may b! e 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 to 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

If you want to get a full essay, visit our page: write my paper