What are the benefits of using calculation view with star join?
What are the benefits of using calculation view with star join?
When you use Calculation view with Star Join, you have the following benefits:
- It simplifies the design process.
- You need not create Analytical views and Attribute Views and directly Fact tables can be used as Projections.
- 3NF is possible with Star Join.
What is a star join in SAP HANA?
Star joins connect a central data entity to multiple entities that are logically related. You can create a graphical calculation view with star joins that join multiple dimensions to a single fact table.
What is Cube with star join?
A Cube with Star Join is a View where we join the attributes with the measure. Create your dimension views and cube views (more of topic here). In the Cube with Star Join, you should be combining data from these views only and not from a data source (tables).
What is the use of star join?
A Star Join node enables you to join the fact data with the descriptive data. The input allowed to the Star Joinnode includes the lower node and all the relevant calculation views of type DIMENSION.
What are star joins?
A set of joins are considered to be a star join when a fact table (large central table) is joined to two or more dimension tables (smaller tables containing descriptions of the column values in the fact table). A Star join is comprised of 3 main parts: Semijoins.
What is Star join?
What are the different types of calculation views in SAP HANA?
You can use two types of Calculation View − Graphical and SQL Script.
What is difference between cube and dimension in calculation view?
You can use two types of Calculation View – Graphical and SQL Script. Cube − When a user selects Cube as data category, the default node is Aggregation. You can choose Star Join with Cube dimension. Dimension − When a user selects Dimension as data category, the default node is Projection.
What is optimize join in SAP HANA?
Purpose of optimize join columns flag Support of a stable aggregation behavior – independent of the fields that are requested by the query – makes sense because a change in aggregation behavior can lead to a change of the resulting values of measures.
What is the difference between analytical view and calculation view?
Analytic views are used to model data that includes measure. A calculation view is used to define more advanced slices on the data in the SAP HANA database.
How do you query star schema?
Querying Star Schemas
- Use GROUP functions and therefore GROUP BY.
- Contain a JOIN of a fact with one or more dimensions.
- Possess lots of WHERE restrictions using dimension columns.
- Scan lots of rows to return relatively few rows of results.
What is a star query?
A typical query in the access layer is a join between the fact table and some number of dimension tables and is often referred to as a star query. In a star query each dimension table is joined to the fact table using a primary key to foreign key join.
What are valid types of calculation view?
There are two types of calculation views that you can create:
- Graphical calculation views: create using a graphical editor.
- Script-based calculation views: create by writing SQL scripts.
What is the difference between calculation view and analytical view in HANA?
Analytic Views are the second type of information view in SAP HANA. Analytic views are used to model data that includes measure. A calculation view is used to define more advanced slices on the data in the SAP HANA database.
What are the different types of calculation view?
What are the different types of joins in SAP HANA?
SAP HANA supports following types of join,
- Inner Join.
- Left Outer Join.
- Right Outer Join.
- Full Outer Join.
- Referential Join.
- Text Join.
How many types of joins in SAP HANA?
All the 4 types of joins explained above are standard database join types. SAP HANA also supports 2 new type of joins. Referential Join and Text Join. These 2 type of joins can only be used in modeling views.
What are different types of views in HANA?
There are three types of views which we will create during data modelling in SAP HANA: attribute views, analytic views, and calculation views.
What is Starnet query model?
3.4.1 Starnet Query Model. OLAP is a multidimensional database, and queries in OLAP can be based on the starnet query model. In a starnet model, radial lines emanate from a central point. Each radial line represents a dimension of the data, and the hierarchy of that dimension is represented along the line.
What is star join in Hana SP7 calculation view?
SAP HANA SP7 has a key feature called STAR JOIN in Calculation View. This feature allows us to easily Model STAR JOIN when modeling with multiple fact tables where we need measures from multiple fact tables.
Can you use Star join with calculation view?
Calculation View with Star Join. It does not allow base column tables, Attribute Views or Analytic views to add at data foundation. All Dimension tables must be changed to Dimension Calculation views to use in Star Join. All Fact tables can be added and can use default nodes in Calculation View.
What are the Hana calculation views and procedures?
SAP HANA calculation views and procedures for complex scenarios help to calculate data on the fly to cut down unload and reload phases to zero when it comes to business-related changes in data staging or extension/reduction in a data model.
Is it wise to switch to virtual data staging for Hana?
(In a modern SAP BW powered by SAP HANA environment, it is wise to switch to virtual data staging instead of old-school data staging via persistency layers.
