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19 Oct

an attribute is a in a relation

C) foreign key. User Hierarchy Properties. Any attribute that has an outgoing relationship must have a unique key relative to its related attribute. For Analysis Services, this specifies a natural relationship and potential aggregation. 3. Q. Relationships representing natural hierarchies are enforced by creating an attribute relationship between the attribute for a level and the attribute for the level below it. For example, consider a Customer dimension based on a relational source table with eight columns: 1. Age… For more information about properties of an attribute relationship, see Configure Attribute Relationship Properties. Attribute relationships define how tables and columns are joined and used, and which tables are related to other tables. A hierarchy is a natural hierarchy when each attribute included in the user-defined hierarchy has a one to many relationship with the attribute immediately below it. Object of relation B. Q. In the Customer dimension, a natural hierarchy exists for the Country, Region, City, and Customer attributes. Q. A primary key whose value is unique across all relations is called a (n): A) global primary key. An attribute in a relation is a foreign key if the __________ key from one relation is used as an attribute in that relation. This set of Database Multiple Choice Questions & Answers (MCQs) focuses on “The Entity-Relationship Model”. Applies to: The natural hierarchy for {Country, Region, City, Customer} is described by adding the following attribute relationships: The Country attribute as an attribute relationship to the Region attribute. When you define a dimension based on a star schema, which is where all dimension attributes are derived from the same relational table, an attribute relationship is automatically defined between the key attribute and each non-key attribute of the dimension. Q. This speeds up dimension, partition, and query processing. Q. Dimension Attribute Properties Reference Age 4. City 7. The relation which has the attribute as Primary key is called _____. A hierarchy is a natural hierarchy when each attribute included in the user-defined hierarchy has a one to many relationship with the attribute immediately below it. For select operation the __________ appear in the subscript and the __________ argument appears in the parenthesis after the sigma. In other words, a member in a source attribute must identify one and only one member in a related attribute. Attributes and Attribute Hierarchies (adsbygoogle = window.adsbygoogle || []).push({}); © 2020 Studytonight. Defining attribute relationships incorrectly can cause invalid query results. Email 6. Azure Analysis Services Therefore, when the IsAggregatable property is set to False on a source attribute for a level, no aggregatable attributes should be added as levels above it. a) Entity set b) Attribute set c) Relation set d) Entity model View Answer To define a level in a user-defined hierarchy using SQL Server Data Tools, the Dimension Designer allows you to select a dimension attribute, a column in a dimension table, or a column from a related table included in the data source view for the cube. Q. For more information about creating user-defined hierarchies, see Create User-Defined Hierarchies. Primary: C. Super: D. Sub: Q. For example, consider the relationship, City -> State. Customer (based on CustomerKey, with CustomerName supplying member names) 2. Between the attribute bound to foreign key in the secondary table and each non-key attribute bound to columns from the secondary table. User Hierarchies A __________ is a property of the entire relation, rather than of the individual tuples in which each tuple is unique. A __________ integrity constraint, requires that the values appearing in specified attributes of any tuple in the referencing relation also appear in specified attributes of at least one tuple in the referenced relation. The SourceAttribute property of a level determines which attribute is used to describe the level. For each table included in a dimension, there is an attribute relationship that relates the table's key attribute to other attributes from that table. In this relationship, the source attribute is City and the related attribute is State. For each table included in a dimension, there is an attribute relationship that relates the table's key attribute to other attributes from that table. For more information about how to use MDX to retrieve member properties, see Using Member Properties (MDX). A Domain is atomic if elements of the domain are considered to be __________ units. Leaf members have no descendents and contain data derived from underlying data sources. All rights reserved. A dimension contains a set of attributes that are organized based on attribute relationships. Which one of the following cannot be taken as a Primary key? An attribute relationship provides the following advantages: Reduces the amount of memory needed for dimension processing. 1. Nonleaf members have descendents and contain data derived from aggregations performed on child members. For more information, see Create, Modify, or Delete an Attribute Relationship. Create, Modify, or Delete an Attribute Relationship, Configure Attribute Relationship Properties. Q. In Analysis Services, an assumption is usually made about the content of members. For each attribute of a relation, there is a set of permitted values, called the __________ of that attribute. CustomerKey 2. Gender 5. The KeyColumns property on the attribute specifies the column in the data source view that supplies the members. View Answer. However, there are a number of reasons why you might want to change these default attribute relationships. Azure Analysis Services When you define a dimension based on a snowflake schema, which is where dimension attributes are derived from multiple related tables, an attribute relationship is automatically defined as follows: Between the key attribute and each non-key attribute bound to columns in the main dimension table. An _____ is a set of entities of the same type that share the same properties, or attributes. Applies to: The relation with the attribute which is the Primary key is referenced in another relation. To define unique attribute relationships, use the Attribute Relationships tab of Dimension Designer. Which of the following is a fundamental operation in relational algebra? 4. The source attribute is the "many" side and the related side is the "one" side of the many-to-one relationship. Entity set B. Which of the following is used to denote the selection operation in relational algebra? A dimension contains a set of attributes that are organized based on attribute relationships. A. Q. SQL Server Analysis Services Increases query performance because storage access is faster and execution plans are better optimized. Power BI Premium. Without relationships, there is no interaction … Attribute relationships are associations between attributes that specify how attributes are connected. Which one of the following is a set of one or more attributes taken collectively to uniquely identify a record? Attribute relationships are known in Multidimensional Expressions (MDX) as member properties. Q. Attribute set C. Relation set D. Entity model. Region The corresponding Analysis Services dimension has seven attributes: 1. For example, you might want to define a natural hierarchy, a custom sort order, or dimension granularity based on a non-key attribute. Users do not see any difference in how the two hierarchies behave, although the natural hierarchy benefits from aggregating and indexing structures - hidden from the user - that account for the natural relationships in the source data. For more information, see Dimension Attribute Properties Reference. This Test will cover complete DBMS with very important questions, starting off from basics to advanced level. In Microsoft SQL Server Analysis Services, attributes within a dimension are always related either directly or indirectly to the key attribute. The key for the source attribute would be City + State. Results in the selection of more effective aggregates by the aggregation design algorithms, provided that user-defined hierarchies have been defined along the relationship paths. Country 8. Which of the JOIN condition contains an equality operator. Power BI Premium. The main constraint when you create an attribute relationship is to make sure that the attribute referred to by the attribute relationship has no more than one value for any member in the attribute to which the attribute relationship belongs. For example, consider a Customer dimension based on a relational source table with eight columns: The corresponding Analysis Services dimension has seven attributes: Customer (based on CustomerKey, with CustomerName supplying member names), Age, Gender, Email, City, Region, Country. foreign key. You can use MDX queries to retrieve data from attribute relationships, in the form of member properties, with the PROPERTIES keyword of the MDX SELECT statement. SQL Server Analysis Services For example, if you define a relationship between a City attribute and a State attribute, each city can only relate to a single state. For navigating data in the cube, you can also create a user-defined hierarchy that does not represent a natural hierarchy in the data (which is called an ad hoc or reporting hierarchy). The relation with the attribute which is the Primary key is referenced in another relation. CustomerName 3. D) foreign attribute. Between the key attribute and the attribute bound to the foreign key in the secondary table that links the underlying dimension tables. The Region attribute as an attribute relationship to the City attribute. For example, you could create a user-defined hierarchy based on {Age, Gender}. The NameColumn property on the attribute can specify a different name column for the members. In Microsoft SQL Server Analysis Services, attributes are the fundamental building block of a dimension. In aggregated levels, members are based on aggregations of subordinate levels. Q. When the underlying data supports it, you should also define unique attribute relationships between attributes. Q. You create this relationship when you create the dimension. View Answer. A. Candidate: B. The City attribute as an attribute relationship to the Customer attribute. Present working model C. Thing in real world D. Model of relation. Entity is a _____ A. In Microsoft SQL Server Analysis Services, attributes are the fundamental building block of a dimension. An attribute in a relation is a foreign key if the _____ key from one relation is used as an attribute in that relation. B) link key. An attribute in a relation of a database that serves as the primary key of another relation in the same database is called a: A) link attribute. Q. The relation which has the attribute as Primary key is called __________.

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