What is Starjoin?

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. Index ANDing of the results of the Semijoins.

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 is the use of 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.

Can we have physical tables on Start join node analytical view calculation?

Attribute view, Analytical views or base table cannot be used in STAR. Join Calculation View.

What is Union in SAP HANA?

A union node combines multiple data sources, which can have multiple columns. You can manage the output of a union node by mapping the source columns to the output columns or by creating a target output column with constant values.

How do you make a star join?

You can create a star join with data category as CUBE or SQL Access Only only. Select the With Star Join checkbox.

Add data sources.
  1. Select the Star Join node.
  2. Choose (Add Data Source).
  3. In the Find Data Sources dialog box, enter the name of the calculation view with descriptive data. Note. …
  4. Choose Finish.
You can create a star join with data category as CUBE or SQL Access Only only. Select the With Star Join checkbox.

Add data sources.
  1. Select the Star Join node.
  2. Choose (Add Data Source).
  3. In the Find Data Sources dialog box, enter the name of the calculation view with descriptive data. Note. …
  4. Choose Finish.

What is SAP modeling?

SAP HANA modeler is a graphical data modeling tool which allows you to design analytical models and later analytical privileges, that governs the access to those models. Information views are created to model various slices of the data stored in an SAP HANA database.

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What is SAP BW fact table?

Fact tables:

In SAP BW, there are two Fact tables for including transaction data for Basis InfoCubes: the F- and the E-Fact tables. /bic/F(cube name) is the F-fact table of a content cube. /bic/E(cube name) is the E-fact table of a content cube.

How do you create a calculated column in calculation view?

Procedure
  1. Open the required calculation view in the view editor.
  2. Select the view node in which you want to create the calculated column.
  3. In the Calculated Columns tab, choose + (Add).
  4. In the General section, enter a name for the new calculated column.
Procedure
  1. Open the required calculation view in the view editor.
  2. Select the view node in which you want to create the calculated column.
  3. In the Calculated Columns tab, choose + (Add).
  4. In the General section, enter a name for the new calculated column.

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.

How do I join two tables in Hana?

Join in SAP HANA is used to Join table and information view and select values as per the requirement. A Join clause combines records from two or more tables /view in a database. 1. The Inner Join selects the set of records that match in both the Tables.

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What is rank node in calculation view?

Rank nodes help you partition the data source for a set of partition columns and then perform an order by SQL operation on the partitioned set. For example, consider a business scenario where you want to retrieve the top five sales for each product using the SALES_TRANSACTION data source.

What is Starjoin?

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 spatial join in Hana?

For spatial joins, you join the two databases tables on columns of spatial data types.

What is attribute in HANA?

The Attribute View in SAP HANA is a set of dimensions or master data which can be joined with the fact table in an Analytic View. An Attribute View can be created by taking data from one or more data tables. The attribute shows relationships between different attributes.

How do I use HANA Modelling?

HANA Modeling is done on the top of tables available in Catalog tab under Schema in HANA studio and all views are saved under Content table under Package. You can create new Package under Content tab in HANA studio using right click on Content and New.

What is a dim table in SQL?

A dimension table is a table in a star schema of a data warehouse. A dimension table stores attributes, or dimensions, that describe the objects in a fact table. In data warehousing, a dimension is a collection of reference information about a measurable event.

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What is text join in Hana?

Text Join is used in order to get language-specific data. Text Join is used to fetch the description based on user’s session language. Once we implement the text join in SAP HANA, it automatically find out user’s language and give description in that language.

What is projection in Hana?

Projection: This is used to select columns, filter the data and create additional columns before we use it in next nodes like a union, aggregation and rank. Note: We can only add one source objects in a Projection node.

How do I concatenate in Hana?

Just use ‘||’ to concatenate string and columns. Suppose that you need a full name of person, and in your table has two columns, the NAME and LAST_NAME.

How do I create a star join in SAP HANA?

The input to the star join node must provide the central fact table. Maintain star join properties. Select the Star Join node. In the Join Definition tab, create joins by selecting a column from one data source, holding the mouse button down and dragging to a column in the central fact table.

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