generate code 39 barcode java NOTE The Query Information tab shows both Cognos and native SQL Two different SQL in Microsoft Office

Encoder QR Code in Microsoft Office NOTE The Query Information tab shows both Cognos and native SQL Two different SQL

NOTE The Query Information tab shows both Cognos and native SQL Two different SQL
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statements appear because Cognos 8 will first turn a query into Cognos SQL, and then it will determine what it can send to the source database server, which becomes the native SQL You should be able to copy the native SQL out of the Query Information and use it as a query directly against your source database The Cognos SQL will differ in some qualification naming, at least, and might include additional directives for things that cannot be passed to the data source, such as functions that may be used in calculations that are not available in the source database Comparing the Cognos SQL to the native SQL can sometimes help you determine why a query might be running slowly
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Options for the Query and for Testing
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Both the Test tab and the Query Information tab display an Options link at the bottom-right corner If you click the Options link, you will see the dialog shown in Figure 15-23 On the Test Settings tab, you can change the number of rows you want to receive when you test your query subject A number of other settings affect the test results, including setting session parameters, design mode filters, security filters, and prompt values Those topics are addressed in the next section, Putting Filters on Your Query Subject, and in 16 On the SQL Settings tab, you can choose two options: the SQL Type and whether to Generate The SQL As A View Or Minimized The SQL Type defaults to Cognos SQL, which is a more standard version of SQL You will usually want to leave this setting on Cognos SQL You will absolutely need to leave it on Cognos SQL if you ever want to re-point your model from one database type, say Oracle, to another, say IBM DB2 One of your other options is native SQL, which you can use if you
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Administration of IBM Cognos 8 Business Intelligence
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FIGURE 15-23
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need to write some SQL specific to your database type to get your desired result, though with two caveats: Cognos is still likely to modify it before passing it to the database, which may increase efficiency; and restrictions mean that not every Select statement valid in your source database can be set to native SQL Your other option is Pass-Through SQL, which will be sent directly to the database as is, with no possibility of Cognos trying to optimize it, but you can write any SQL valid in your source database Our advice is to leave the SQL Type set at Cognos SQL unless you have a compelling reason to write database-specific SQL that is not valid in Cognos SQL If that is the case, try Native If that fails, then you probably have a bad SQL statement, so you might want to try running it through your source database tools outside the Cognos environment to show that it is not a Cognos problem Try Pass-Through only as a last resort As for the Generate setting, your options are Minimized, which is the default, and As View Leave this set to the default value of Minimized unless you have a compelling reason to change it Minimized tells Cognos to pull into the final query only the fields that are needed to satisfy the report So even if you have a data source query subject for the Product table written as Select * From PRODUCTS, if you report only on the PRODUCT_NAME, then the SQL passed to the database will be Select PRODUCT_NAME From PRODUCT rather than less efficiently selecting all columns The Minimized setting will always be at least as efficient as, and usually more efficient than, running As View You can choose the As View setting in those limited cases where executing the query as a view would return the proper set of resulting rows, whereas trying to run it Minimized might return extra rows that you do not want For instance, if a query subject combines
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