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Universe Joins
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About ANSI 92 or SQL 92
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The American National Standards Institute (ANSI) develops a number of standards, including those that affect SQL syntax With these standards, SQL is a universal language with common syntax that each RDBMS understands (in theory) In 1992, ANSI provided major revisions to SQL These revisions are referred to as ANSI 92 or SQL 92 In reality, each RDBMS has its own SQL dialect with specific functions that may not be part of the SQL 92 standard The ability to understand the SQL 92 is dependent on the RDBMS and its version For example, Oracle 9i supports ANSI 92, but earlier versions do not Support within SQL Server 2000 for ANSI 92 is set via an RDBMS parameter In addition to the RDBMS having to support ANSI 92, you also have to tell BusinessObjects XI to generate queries using SQL 92 syntax For example, the preceding outer join is in SQL 1 syntax SQL 92 syntax is as follows:
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Article_lookup LEFT OUTER JOIN Shop_facts ON (Shop_factsArticle_id=Article_lookupArticle_id)
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PART II
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Oracle in SQL 1 syntax uses the + to indicate the outer join The + always goes on the table that has fewer records (yes, it feels illogical to me, too!) As there are more article codes in inventory than have had sales yet, the + goes on the fact table:
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SHOP_FACTSARTICLE_ID(+)=ARTICLE_LOOKUPARTICLE_ID
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With ANSI 92, the Oracle syntax would be the same as the MS Access syntax:
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Setting Universe Parameters for ANSI 92
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If your database supports ANSI 92, you should set this parameter to YES for each universe 1 Select Parameter from the toolbar or File | Parameters from the pull-down menus 2 Select the Parameter tab 3 From the list of available parameters, select ANSI92
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Part II:
A Better Universe
4 In the Value box, change the default No to Yes 5 Click Replace to change the value 6 Click OK to save the parameter changes
C AUTION if you accidentally click OK without selecting Replace first, the parameter will not be
changed
Loops and Contexts
Loops occur when there are two different paths to accomplish one join The following structure now includes PRODUCT_PROMOTION_FACTS in the Test Fashion universe If users want to analyze articles versus time, there are now two join paths BusinessObjects XI does not know which path to take, the one via SHOP_FACTS or the one via PRODUCT_PROMOTION_FACTS Is the business question which products sold when or which products were promoted when The circular appearance of these four joins is a loop, which can give undesired SQL results, usually returning fewer rows than expected
The query behavior between Desktop Intelligence and Web Intelligence is slightly different If Desktop Intelligence users tried to create a query based on articles and time, prior to the administrator resolving this loop, they would receive the following error message:
8:
Universe Joins
Web Intelligence users, meanwhile, would be allowed to create a query that contains the loop (see the later section Are Loops a Bad Thing ) Contexts help break this loop into two sets of join statements, so the desired join path is always clear and so business users can answer perfectly valid business questions
Valid Business Questions That Demand Contexts
Following are two sample business questions that often involve multiple star schemas that would require the use of contexts (and that would otherwise cause a loop if you didn t use contexts)
Days Sales Inventory (DSIs)
How many days worth of inventory do you have according to the daily sales volume As shown in Figure 8-2, this query would involve two contexts, one with all the joins for the star schema with a SALES_FACT table and a second context with all the joins related to INVENTORY_FACT Although certain tables appear twice in this figure (Plant, Time, and Product), this is strictly for conceptual purposes; they exist only once in the physical database
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