- What is a primary key A primary key of one table that appears as an attribute in another table and acts to provide a logical relationship among the two tables?
- What is the duplication of data or the storage of the same data in multiple places?
- Why do relational databases use foreign keys?
- What is the primary difference between an entity and an attribute?
- Is a field or group of fields that uniquely identifies a given entity in a table?
- What is unique key in database?
- What is a field that uniquely identifies a given record in a table foreign key primary key data mining key DBMS key?
- Which of the following is a field or group of fields that uniquely identify a given record in a database table?
- Which of the following will help to maintain unique record in the table?
- What is derived attribute?
- What is an attribute and entity?
- What is a common association detection analysis?
- Is a unique field in table?
- Which of the following is a unique field in a table?
- What is a characteristic of a table?
- How do you represent a derived attribute in a table?
- What is composite attribute?
- What are attributes in a table?
- What are attributes in database table?
- What is a common association detection analysis quizlet?
- What is a common association detection analysis technique where you analyze certain items to detect customers buying behavior?
- What makes a record unique?
- Which of the following uniquely identifies each row in a table?
- What is unique field?
- What is descriptive attribute?
- What defines the structure of the table?
- What is a field in database?
- What is a field attribute in a database?
- What’s a derived attribute?
- What are derived attributes?
- What is a field in SQL?
What is a primary key A primary key of one table that appears as an attribute in another table and acts to provide a logical relationship among the two tables?
A foreign key is a primary key of one table that appears as an attribute in another table and acts to provide a logical relationship between the two tables.
What is the duplication of data or the storage of the same data in multiple places?
Data replicationData replication is the process of storing the same data in multiple locations to improve data availability and accessibility, and to improve system resilience and reliability.
Why do relational databases use foreign keys?
A relational database is designed to enforce the uniqueness of primary keys by allowing only one row with a given primary key value in a table. A foreign key is a column or a set of columns in a table whose values correspond to the values of the primary key in another table.
What is the primary difference between an entity and an attribute?
What is the primary difference between an entity and an attribute? An entity (also known as a table) stores information about people, places, or events, whereas an attribute is a column or specific field of the data elements associated with an entity.
Is a field or group of fields that uniquely identifies a given entity in a table?
A foreign key is a field (or group of fields) that uniquely identifies a given entity in a table.
What is unique key in database?
In relational database management systems, a unique key is a candidate key that is not the primary key of the relation. All the candidate keys of a relation can uniquely identify the records of the relation, but only one of them is used as the primary key of the relation.
What is a field that uniquely identifies a given record in a table foreign key primary key data mining key DBMS key?
The relationships are built using Primary Keys and Foreign Keys, a primary key is a field that uniquely identifies a given record in a table, and a foreign key is a primary key one table that appears as an attribute in another table and acts to provide a logical relationship between the two tables.
Which of the following is a field or group of fields that uniquely identify a given record in a database table?
A foreign key is a field (or group of fields) that uniquely identifies a given entity in a table.
Which of the following will help to maintain unique record in the table?
Answer: Some systems will not allow key values to be updated, all systems will not allow duplicates. This ensures that uniqueness is maintained in both the primary table and any…..
What is derived attribute?
A derived attribute is an attribute whose values are calculated from other attributes. In a student table if we have an attribute called as date_of_birth and age. We can derive value of age with the help of date_of_birth attribute.
What is an attribute and entity?
The main difference between Entity and Attribute is that an entity is a real-world object that represents data in RDBMS while an attribute is a property that describes an entity. Relational Database Management System (RDBMS) is a type of database management system based on the relational model.
What is a common association detection analysis?
Structured query language. What is a common association detection analysis technique where you analyze certain items to detect customers’ buying behavior and predict future behavior. Market basket analysis.
Is a unique field in table?
In a relational database, a candidate key uniquely identifies each row of data values in a database table. A candidate key comprises a single column or a set of columns in a single database table.
Which of the following is a unique field in a table?
address will be a unique field in a table .
What is a characteristic of a table?
Table and its Characteristics: A table is perceived as a two-dimensional structure composed of rows and columns. A table is perceived as a two-dimensional structure composed of rows and columns. 2. Each table row (tuple) represents a single entity occurrence within the entity set.
How do you represent a derived attribute in a table?
Stored attribute is represented by an oval. Derived attribute are represented by a dotted oval.
What is composite attribute?
“Composite attribute is an attribute where the values of that attribute can be further subdivided into meaningful sub-parts.” Typical examples for composite attribute are, Name – may be stored as first name, last name, middle initial.
What are attributes in a table?
Think of an attribute as a characteristic A database consists of tables, each of which has columns and rows. Each row (called a tuple) is a data set that applies to a single item, and each column contains characteristics that describe the rows. In database lingo, these columns are called attributes.
What are attributes in database table?
In relational databases, attributes are the describing characteristics or properties that define all items pertaining to a certain category applied to all cells of a column. The rows, instead, are called tuples, and represent data sets applied to a single entity to uniquely identify each item.
What is a common association detection analysis quizlet?
What is a common association detection analysis technique where you analyze certain items to detect customers’ buying behavior and predict future behavior.
What is a common association detection analysis technique where you analyze certain items to detect customers buying behavior?
A typical example of frequent itemset mining is market basket analysis. This process analyzes customer buying habits by finding associations between the different items that customers place in their “shopping baskets” (Figure 6.1).
What makes a record unique?
Unique records are those for which, for the value of a given field, no other records have the same value. Note that in each case we must describe which field(s) we mean when we say unique or duplicate.
Which of the following uniquely identifies each row in a table?
primary keyEvery table must have a primary key, which uniquely identifies rows in the table. Foreign keys are columns used to reference a primary key in another table.
What is unique field?
A unique field is a field in a record whose value makes the record unique. For example, the email address field could be marked as a unique field because, clearly, no two people can have the same email address.
What is descriptive attribute?
A descriptive attribute or simply a descriptor, on the other hand, describes a non-unique characteristic of an entity instance. For example, the attributes Price and Page_count are the descriptive attributes as two books can have the same price and number of pages.
What defines the structure of the table?
It consists of columns and rows. In relational databases, and flat file databases, a table is a set of data elements (values) using a model of vertical columns (identifiable by name) and horizontal rows, the cell being the unit where a row and column intersect.
What is a field in database?
In a database table, a field is a data structure for a single piece of data. Fields are organized into records, which contain all the information within the table relevant to a specific entity. The records make up the table rows and the fields make up the columns.
What is a field attribute in a database?
The Database Field Attributes page is where you maintain database fields and folder fields using the report wizard. You define a database field by naming the field and specifying the properties of the field. You define a folder field by naming the field.
What’s a derived attribute?
A derived attribute is an attribute whose values are calculated from other attributes. In a student table if we have an attribute called as date_of_birth and age. We can derive value of age with the help of date_of_birth attribute.
What are derived attributes?
Derived attribute − Derived attributes are the attributes that do not exist in the physical database, but their values are derived from other attributes present in the database. For example, average_salary in a department should not be saved directly in the database, instead it can be derived.
What is a field in SQL?
Records and Fields in SQL Tables contain rows and columns, where the rows are known as records and the columns are known as fields. A column is a set of data values of a particular type (like numbers or alphabets), one value for each row of the database, for example, Age, Student_ID, or Student_Name.