What is a logical key?
The logical key data type allows the DBMS Server or your application to assign a unique key value to each row in a table. Logical keys are useful when an application requires a table to have a unique key, and the columns of the table do not comprise a unique key.
What is DSV in SSAS?
A DSV is a required component of a multidimensional model. Most Analysis Services developers create a DSV during the early phases of model design, generating at least one DSV based on an external relational database that provides underlying data.
Can there be 3 primary keys?
A table can only ever have a one primary key. It is not possible to create a table with two different primary keys. You can create a table with two different unique indexes (which are much like a primary key) but only one primary key can exist.
What are the four rules of a primary key?
The primary key should be compact (avoid the use of long data types)….The general rules when designing a primary key are:
- The primary key value must uniquely identify one and only one record within the table.
- The primary key value must NOT be null.
- The primary key value must NOT change.
What is primary key and foreign key?
A primary key is used to assure the value in the particular column is unique. The foreign key provides the link between the two tables.
What is a dimension in SSAS?
SSAS dimensions are groups of attributes based on columns from tables or views in a data source view. Dimensions exist independent of a cube, can be used in multiple cubes, can be used multiple times in a single cube, and can be linked between Analysis Services instances.
What is Cube Wizard?
You can use the Cube Wizard to create local cubes for when there is no connection to an Analysis Services database alias. This tool is only available for Analysis Services databases. By default, when you create a local cube, the cube definition is saved to a file which you specify.
Can an entity have two primary keys?
Yes, you can have Composite primary keys, that is, having two fields as a primary key.
Can 2 tables have the same primary key?
Yes. You can have same column name as primary key in multiple tables. Column names should be unique within a table. A table can have only one primary key, as it defines the Entity integrity.
Does every entity need a primary key?
The primary key is an attribute or a set of attributes that uniquely identify a specific instance of an entity. Every entity in the data model must have a primary key whose values uniquely identify instances of the entity.
What are the types of primary key?
Primary Key. The primary key refers to a column or a set of columns of a table that helps us identify all the records uniquely present in that table.