Equijoin - Study guides, Class notes & Summaries

Flat Files a file having no internal hierarchy Hashed Files A file that has been encrypted for security purposes. Brainpower Read More Previous Play Next Rewind 10 seconds Move forward 10 seconds Unmute 0:01 / 0:15 Full screen Heap File An unsorted set of records. Information The transformation of raw data into useful facts. Punch Card A card that is perforated and can hold commands or data. Structured Data Information with a high degree of ...

E-R Model It is well named, as it diagrams entities (together with their attributes) and the relationship among them. Describe the ER model for "A salesperson works in one office." - What is the name of this relationship? exists when two entities are associated/relationship - Ex. A professor teaches many classes. - One-to-one binary relationship Brainpower Read More 0:02 / 0:15 Describe the ER model for "A salesperson sells to many customers." - What is the name ...

A _____ key can be described as a minimal superky, a superkey without any unnecessary attributes. - candidate The _____ relationship should be rare in any relational database design. - 1:1 A _____ is a key that can uniquely identify any row in the table. - superkey Rows are sometimes referred to as _____. - records Date attributes contain calendar dates stored in a special format known as the _____ date format. - Julian A(n) _____ links tables on the basis of an equality condition that co...

Use the USING clause to specify the columns for the equijoin where several columns have the same names but not same data types.  Use the USING clause to match only one column when more than one column matches.  The NATURAL JOIN and USING clauses are mutually exclusive. Syntax: SELECT n, n FROM table1 JOIN table2 USING (join_column1, join_column2…); Explanation:  table1, table2 are the name of the tables participating in joining.  The natural join syntax contains the NATURAL k...

INSY 3304 CH 3 EXAM STUDY GUIDE WITH COMPLETE SOLUTIONS If a foreign key contains either matching values or nulls, the tables that make use of such a foreign key are said to exhibit ________ integrity. - Answer-Referential The use of a(n) ________ relationship ensures that two entity sets are not placed in the same table when they should not be. - Answer-1 : 1 A relational operator that yields all rows in one table that are not found in the other table is the ________ operator. - Answer-d...

WGU C170 Chp 1, With Complete Verified Solution 2024. 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 p...

Chapter 3: The Relational Database Model TRUE/FALSE 1. The practical significance of taking the logical view of a database is that it serves as a reminder of the simple file concept of data storage. ANS: T PTS: 1 2. You can think of a table as a persistent representation of a logical relation. ANS: T PTS: 1 3. Because the relational model uses attribute values to establish relationships among tables, many database users correctly assume that the term relation refers to such relationships. ...

AREA - In DB2, a named section of permanent storage space that is reserved to store the database. associative entity - See composite entity. bridge entity - See composite entity. candidate key - A minimal superkey; that is, a key that does not contain a subset of attributes that is itself a superkey. See key. closure - A property of relational operators that permits the use of relational algebra operators on existing tables (relations) to produce new relations. composite entity - An enti...

WGU C170 Chp 1, With Complete Verified Solution 2024. 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 p...

AREA - In DB2, a named section of permanent storage space that is reserved to store the database. associative entity - See composite entity. bridge entity - See composite entity. candidate key - A minimal superkey; that is, a key that does not contain a subset of attributes that is itself a superkey. See key. closure - A property of relational operators that permits the use of relational algebra operators on existing tables (relations) to produce new relations. composite entity - An enti...