exams and notes

binary relationship -An ER term for an association (relationship) between two entities. For example, PROFESSOR teaches CLASS. cardinality -An attribute that can be further subdivided to yield additional attributes. For example, a phone number such as may be divided into an area code (615), an exchange number (898), and a four-digit code (2368). Compare to simple attribute. composite identifier -In ER modeling, a key composed of more than one attribute. derived attribute -An attribute that...

access plan - A set of instructions generated at application compilation time that is created and managed by a DBMS. The access plan predetermines how an application's query will access the database at run time. algorithms - A process or set of operations in a calculation. automatic query optimization - A method by which a DBMS finds the most efficient access path for the execution of a query. B-tree index - An ordered data structure organized as an upside-down tree. bitmap index - An in...

AREA - in DB2, a named section of permanent storage space that is reserved to store the database. associative entity - another name for composite entity, bridge entity or linking table bridge entity - another name for composite entity, associative entity or linking table candidate key - a minimal superkey; that is, a key that dows not contain a subset of attributes that is itself a superkey. closure - A property of relational operators that permits the use of relational algebra operators ...

domain - In data modeling, the construct used to organize and describe an attribute's set of possible values superkey - An attribute or attributes that uniquely identify each entity in a table. Any composite key with this is also this. candidate key - A minimal superkey; that is, a key that does not contain a subset of attributes that is itself a superkey entity integrity - The property of a relational table that guarantees each entity has a unique value in a primary key and that the key...

Unary relationships are common in manufacturing industries. - TRUE _________________ not only helps database designers to stay on track during the design process, it also enables them to pick up the design thread when the time comes to modify the design. - Documentation Ideally, an entity identifier is composed of _____ attribute(s). - one The first step in building an entity-relationship diagram (ERD) is ___________________________________________________________. - creating a detailed n...

A salesperson is authorized to sell many products and a product can be sold by many salespersons. Which kind of binary relationship does this scenario describe? - Many-to-many Which two examples are attributes? - An employee number; A meeting code Which delete rule sets column values in a child table to a missing value when the matching data is deleted from the parent table? - Set-to-null Refer to the given SQL statement. CREATE TABLE member ( member_id INT UNSIGNED NOT NULL AUTO_INCREME...

Associative Entity - All relationships for the (...) entity should be many. Attribute - An (...) is a property or characteristic of an entity. Binary relationship - A (...) is a relationship between two entity types. Cardinality - (...) represents the maximum number of entities that can be involved in a particular relationship. Cascade Delete - Will delete all records that reference the primary key Database - A (...) is a collection of information that is organized so that it can easily be...

An inequality condition is also known as a natural join and an equality condition is also called a theta join. - False When using a(n) _____ join, only rows that meet the given criteria are returned. - inner The statement SELECT * FROM T1, T2 produces a(n) _____ join. - cross A(n) _____ join will select only the rows with matching values in the common attribute(s). - natural If a designer wishes to create an inner join, but the two tables do not have a commonly named attribute, he can use...

Add New Row - INSERT INTO table_name (column1, column2, ...) VALUES (value1, value2, value3, ...); Update Row - UPDATE table_name SET column1 = value1, column2 = value2, ... WHERE condition; Delete Row - DELETE FROM table_name WHERE condition; Inner Join - SELECT column_name(s) FROM table1 INNER JOIN table2 ON n_name = n_name; CREATE VIEW - CREATE VIEW viewname AS SELECT Col1, Col2 FROM table WHERE condition; Concatenate - CONCAT(Col1, Col2) AS NewColumnName; Create Index - CREAT...

Create Database Syntax - CREATE DATABASE db_name; Simple SFW query syntax - SELECT * FROM db_name WHERE column_name operator value; Cardinality: Inside or outside? - Outside Modality: Inside or outside? - Inside What commands are used with data definition? - create, alter, drop, truncate, comment, rename What commands are used with data manipulation? - Select, Insert, Update, Delete, Merge, Call, Explain Plan, Lock Table Create Table Syntax - CREATE TABLE table_name ( column_name1 data_...