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How does union work in SAP HANA?

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How does union work 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.

Which operation does union node perform in a view?

It works as a UNION ALL operator. This means that keeps piling one data set below the next without aggregating them.

How does SAP HANA improve performance of calculation view?

SAP HANA Calculation View Performance Tips

  1. Try not to transfer large result sets between HANA DB and client applications (e.g. Analysis for Office)
  2. Always try to do calculation after aggregation (Aggregation removes duplicate results or aggregate them before display)

Which types of calculation views are available in SAP HANA?

Calculation Views are used to consume Analytic, Attribute and other Calculation Views. They are used to perform complex calculations, which are not possible with other Views. There are two ways to create Calculation Views- SQL Editor or Graphical Editor. Built-in Union, Join, Projection & Aggregation nodes.

Which is faster union or join?

4 Answers. Union will be faster, as it simply passes the first SELECT statement, and then parses the second SELECT statement and adds the results to the end of the output table.

What is union with constant values in SAP HANA?

In a union view, a Constant Column is created if there are any target or output attributes for which there are no mappings to the source attributes. The default value for the constant column is NULL. Note The target attribute is mapped to all the sources.

How do I create a calculation view in Hana studio?

Steps to Create a Calculation View in SAP HANA

  1. Step 1: Select Tables.
  2. Step 2: Create a DIM information view.
  3. Step 3: Converting dimension tables into DIM calculation tables.
  4. Step 4: Adding dimension tables and columns.
  5. Step 5: Create a calculation view.
  6. Step 6: Add measure/ fact tables.
  7. Step7: Join the fact tables.

How do I open the calculation view in Hana studio?

SAP HANA Graphical Calculation View

  1. Go to package (Here Modelling) and right click.
  2. Select New Option.
  3. Select Calculation View.

How do I optimize Hana views?

SAP HANA Table-level Optimization

  1. Use the appropriate table type based on the usage.
  2. Avoid using indexes on non-unique columns.
  3. Get better performance by assigning range, hash, and round-robin partitions to the large tables since the amount of data brought into working memory can be limited.

How do I improve my Hana performance?

Always follow – HANA Development Points Use table functions instead of scripted calculation views. Avoid script-based calculation view, WHERE clause will not be pushed down. Using Filter is better than using Inner Join to limit the dataset. Avoid filters on calculated column (consider materializing these columns).

What are 5 different views on data that SAP provides?

different views

  • database view.
  • projection view.
  • maintanance view.
  • help view.

What is analytical view in SAP HANA?

Analytic view is an information view. 2.It joins together one central fact table, which contains the measures with any number of other tables (or) attribute views. 3. This is the basic view type that is directly used as source of data for reporting. Analytic view can be comparable to InfoCubes in SAP BW.

How do I enable Union pruning on the Hana calculation view?

To enable pruning on the HANA Calculation view add a pruning configuration table created in the Advanced section setting. Note: If the configuration table is empty then the HANA calculation view will execute as normal WITHOUT union pruning as discussed earlier.

What is data modeling in SAP HANA using calculation view?

Data Modeling in SAP HANA using calculation view is one of the supreme capabilities provided for end user to mold his raw data in to a well structured result set by leveraging multiple operational capabilities exposed by calculation view. On the way of achieving this we need to think on different aspects involved.

What is the execution time of a column search in Hana?

Column search is performed on ALL data sources (projections). Execution time: ~556 ms for 1000 records. WITH union pruning HANA calculation view Steps, EXPLAIN PLAN, and Execution time. Create a pruning configuration table. Maintain the entries in the configuration table.

What are the operators available in SAP HANA?

SAP HANA Operator can be used for calculation, value comparison or to assign value. SAP HANA Contain below operators- Unary and Binary Operator Unary plus operator (+) Unary negation operator (-) Logical negation (NOT)

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