What is spurious tuples?

Spurious Tuples are those rows in a table, which occur as a result of joining two tables in wrong manner. They are extra tuples (rows) which might not be required.

1. How can we prevent spurious tuples?
2. What is dangling tuples in DBMS?
3. What is tuples in data base?
4. What are rows and tuples?
5. Why is spurious tuples generated?
6. What is Rdbms degree?
7. What is active database in DBMS?
8. Why is normalization of relations necessary?
9. What is join dependency in DBMS?
10. What is tuples in information technology?
11. What is tuples and attributes?
12. What is an tuple?
13. What is the difference between tuple row and record?
14. What is row record tuple?
15. What is row and column?

How can we prevent spurious tuples?

Disallowing the possibility of generating spurious tuples

Avoid relations that contain matching attributes that are not (foreign key, primary key) combinations because joining on such attributes may produce spurious tuples.

What is dangling tuples in DBMS?

A tuple that does not participate in a natural join is called a dangling tuple. Dangling tuples may indicate a consistency problem in the database. Referential integrity constraints specify exactly when dangling tuples indicate a problem.

What is tuples in data base?

A tuple is simply a row contained in a table in the tablespace. A table usually contains columns and rows in which rows stand for records while columns stand for attributes. A single row of a table that has a single record for such a relation is known as a tuple.

What are rows and tuples?

In the context of a relational database, a row—also called a tuple—represents a single, implicitly structured data item in a table. In simple terms, a database table can be thought of as consisting of rows and columns.

Why is spurious tuples generated?

A spurious tuple is, basically, a record in a database that gets created when two tables are joined badly. In database-ese, spurious tuples are created when two tables are joined on attributes that are neither primary keys nor foreign keys.

What is Rdbms degree?

Degree is the total number of attributes/fileds of a relation/table and cardinality is total number of tuples/rows of relation/table.

What is active database in DBMS?

An active database is a database that includes an event-driven architecture (often in the form of ECA rules) which can respond to conditions both inside and outside the database. Possible uses include security monitoring, alerting, statistics gathering and authorization.

Why is normalization of relations necessary?

Normalization is the process of minimizing redundancy from a relation or set of relations. Redundancy in relation may cause insertion, deletion, and update anomalies. So, it helps to minimize the redundancy in relations. Normal forms are used to eliminate or reduce redundancy in database tables.

What is join dependency in DBMS?

Join dependency is a constraint which is similar to functional dependency or multivalued dependency. It is satisfied if and only if the relation concerned is the join of a certain number of projections. Such type of constraint is called join dependency.

What is tuples in information technology?

A tuple is an ordered sequence of elements that is immutable, which means that the values within the tuple cannot be modified when the program is running. ... A tuple is a useful way of grouping and organising data items to make them easier to access and use. A tuple can be used to return multiple values from a function.

What is tuples and attributes?

An attribute value is an attribute name paired with an element of that attribute's domain, and a tuple is a set of attribute values in which no two distinct elements have the same name. ... A set of attributes in which no two distinct elements have the same name is called a heading.

What is an tuple?

In mathematics, a tuple is a finite ordered list (sequence) of elements. An n-tuple is a sequence (or ordered list) of n elements, where n is a non-negative integer. There is only one 0-tuple, referred to as the empty tuple. ... The term tuple can often occur when discussing other mathematical objects, such as vectors.

What is the difference between tuple row and record?

Tuple is nothing but a row in a table. while using relational algebra we often mention a row as a tuple. On the other hand while we are referring our data in terms of files we use a term called “ RECORD “ for representing a row . Logically tuple and record are referred to same term called a “row”.

What is row record tuple?

A single entry in a table is called a Tuple or Record or Row. A tuple in a table represents a set of related data. For example, the above Employee table has 4 tuples/records/rows. Following is an example of single record or tuple.

What is row and column?

A row is a series of data put out horizontally in a table or spreadsheet while a column is a vertical series of cells in a chart, table, or spreadsheet. Rows go across left to right. On the other hand, Columns are arranged from up to down.