Data Modeling in Sap Hana With Sample Efashion Database Part II

Generated by Jive on 2014-06-03+02:001

SAP HANA Developer Center: Data Modelingin SAP HANA with sample eFashionDatabase-Part II

Posted by Mohammad Shafiullah Mar 22, 2014In first part Data Modeling in SAP HANA with sample eFashion Database-Part I ,we created schemaeFashion, 6 dimension tables and 2 fact tables.We also loaded data in all tables using BODS flat file option. Following catalog has been created in HANA.

Now let us start creating Information model.There are three information views group together under a containercalled Package.Package created under CONTENT folder.

ATTRIBUTE VIEW: Attribute views are the reusable dimensions or subject areas used for businessanalysis.You can use attribute views to join master data tables to each other.

ANALYTIC VIEW: Analytic views are the multidimensional views or OLAP cubes.Using analyticviews you analyze values from a single fact table that is based on the related attributes from the datafoundation and attribute views.Analytic views are consumed by Report.

CALCULATION VIEW:Calculation views are used to create your own data foundation using otherviews or database tables.A calculation view can join several fact tables.Calculation views can becreated as graphical views or as scripted views.Calculation views are consumed by reports.

1. CREATE HANA PACKAGE: Select Content folder. Right Mouse Click > New > Package Provide Package Definition

SAP HANA Developer Center: Data Modeling in SAP HANA with sample eFashion Database-Part II


2. CREATE ATTRIBUTE VIEW Select eFashion package Right Click > New > Attribute View Provide View Definition Next, Select ARTICLE_COLOR_LOOKUP table,Finish Add Attributes Select ARTICLE_COLOR_LOOKUP_ID > Right Click > Add as Key Attribute Validate > Save & Activate There are two scenarios in Attribute view.

Data Foundation:Container of attributes and joins.Details area shows the attributes andOutput columns and their properties

Semantics:Shows the properties,Columns and Hierarchy. Attribute View must have a Key attribute. Once attribute columns and key attributes define,click on Validate and then Save and Activate.



Repeat above process to create Attribute View for all dimension tables.

3. CREATE ANALYTIC VIEW FOR SHOP_FACT. Select efashion package> Right Click > New > Analytic View. Provide View Definition. Next, Select SHOP_FACT table. Next, Select Dimensions. Finish Add Attributes

SHOP_FACT,ARTICLE_ID,COLOR_CODE,WEEKID,SHOP_ID Add Measures

MARGIN,AMOUNT_SOLD,QUANTITY. Create Calculated Measures. Join Fact Tables and Dimensions Validate Save and Activate. Data Preview. Analytic View contains Semantics,Logical Joins and Data Foundation scenarios. Data Foundation consist of one or more FACT tables. Logical Join area contains Dimensions and Fact tables linked together in the form of star like

structure;Fact table center surrounded by dimension tables.This is also called as Star Schema.



Analytic views are created as Column Views under system defined catalog _SYS_BIC.

Calculated columns can be created as shown in below screenshot. Click on Logical Join > Right Click on Calculated Column > New Calculated Column..



4. CREATE ANALYTIC VIEW FOR PROMOTION FACT: Follow similar process to create Analytic view forpromotion fact.



5. CREATE CALCULATION VIEW USING GRAPHIC VIEW:

Select eFashion package > Right Click > New > Calculation View.. Provide View Definition Next,Select Analytic Views, Finish Select UNION > Link Analytic Views to UNION > Link UNION to OUTPUT Select UNION and MAP elements Select OUTPUT > Add Attributes and Measures Validate > Save & Activate >Data Preview Calculation views contains Semantics,Aggregation,Union,Join,Projection objects. UNION is used to combine two or more Analytic views. Aggregation in Calculation views is highly optimized. Calculation views can be created either as GRAPHICAL or SCRIPTED. SCRIPTED Calculation view support CE(Calculation Engine) functions,highly optimized for

UNION,AGGREGATION,JOIN. Use of CE function recommended over SQL command.



6. CREATE CALCULATION VIEW USING SQL SCRIPT -CE FUNCTION:



Select eFashion package > Right Click > New > Calculation View.. Select SQL Script

/********* Begin Procedure Script ************/

BEGIN

/** CREATE SALES ANALYTIC VIEW**/

AV_SALES=CE_OLAP_VIEW

("_SYS_BIC"."efashion/AV_SHOP_FACTS",

["ARTICLE_LABEL", "CATEGORY", "QTR", "MONTH_NAME", sum("AMOUNT_SOLD") AS"AMOUNT_SOLD"]

);

/** CREATE PROMOTION ANALYTIC VIEW**/

AV_PROMOTION=CE_OLAP_VIEW



("_SYS_BIC"."efashion/AV_PROMOTION",

["ARTICLE_LABEL", "CATEGORY", "QTR", "MONTH_NAME", sum("PROMOTION_COST") AS"PROMOTION_COST"]

);

/**CREATE SALES PROJECTION**/

SALES_PROJECTION=CE_PROJECTION(:AV_SALES, ["ARTICLE_LABEL","CATEGORY", "QTR", "MONTH_NAME", "AMOUNT_SOLD" AS "AMOUNT", CE_CALC('''SALE''', VARCHAR(4)) AS "DATA_TYPE"]);

/**CREATE PROMOTION PROJECTION**/

PROMOTION_PROJECTION=CE_PROJECTION(:AV_PROMOTION, ["ARTICLE_LABEL", "CATEGORY", "QTR", "MONTH_NAME", "PROMOTION_COST" AS "AMOUNT", CE_CALC('''PROM''', VARCHAR(4)) AS "DATA_TYPE"]);

/**UNION*//

var_out = CE_UNION_ALL(:SALES_PROJECTION,:PROMOTION_PROJECTION);

END/********* End Procedure Script ************/



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Data Modeling in Sap Hana With Sample Efashion Database Part II