Database Concepts

FUNDAMENTAL DATABASE CONCEPTS Data Hierarchy in a Database (from last 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 (#,@,$). transparent (Attribute or Column): Group of characters that represent a field ( human body, social security number, address, etc.). ** In a relational database worry system, much(prenominal) as Access or Oracle, the term COLUMN is apply interchangeably with attribute or field. Record: A free solution of link up fields (e.g., a specific pupils social security number, promise, address, major, etc.). File (Table): A company of connect records (e.g., a stick finishing records of students, or a file containing records of faculty). We volition not life students and f acultys records in a single file because a file should not contain unrelated records. ** A mesa is typically shown as: postpone_name(column_name, column_name). And alike we use an abbreviation of the dining table 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 distinguishable databases helps effective administration and management of these databases. For example, different database 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 separately 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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