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4 informatica transformation types sq and exp
The document describes different types of transformations in data integration including source qualifier, expression, aggregator, sorter, filter, joiner, lookup, update strategy, router, sequence generator, union, and unstructured data. It provides details on source qualifier and expression transformations. Source qualifier is used to qualify a data source and expression is used to calculate values in a single row before writing to the target.
4 informatica transformation types sq and exp
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- 2. Transformation Types SourceQualifier Expression Aggregator Sorter Filter Joiner Lookup Update Strategy Router Sequence Generator Union Unstructured data Transaction Control
- 3. Connected Active Source Qualifier Transformation Source qualifier qualifies a relational or flat file source definition in a mapping Source qualifier represents the rows that Integration Service reads when it executes a session Source qualifier displays transformation data types. These determine how the source database binds data when Integration Service reads it. Do not alter data types in Source qualifier
- 4. Source Qualifier Tasks Join data originating from same source database Filter records at the time of read Specify an outer join instead of default inner join Specify sorted ports – Order by clause Select distinct values from source Create a custom query to issue a special select statement to read
- 5. Data Extract IntegrationService generates a query for each source qualifier when it runs session Default query is SELECT statement for extracting data for each source column used in mapping Default query does not contain columns that are not used in mapping
- 6. Default query override In SQL query properties tab, alter or override the default query Do not change the list of selected ports or the order they appear in the query SQL query overrides the user defined join, source filter, number of sorted ports and select distinct setting of the source qualifier
- 7. Joining source data Source qualifier can be used to join multiple relational tables provided they are from same database Joiner Transformation is used if the sources are heterogeneous or flat files Default join is inner equijoin based on related keys in each table
- 8. Custom Join Overridethe default join when: – Columns do not have primary-foreign key relationship – Datatypes of columns used for join do not match – Specify different type of join such as outer join Create primary foreign key relationship in Source Analyzer to join the two table in Source qualifier
- 9. Specifying Source Qualification Override default SQL Query Enter User defined Join Outer Join – Left & Right Combine multiple joins in a source qualifier in following order – Normal – Left Outer – Right Outer Entering a Source filter Sorting the source data Select Distinct Adding Pre and Post session SQL commands
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- 13. Connected Passive Expression Expression is used to calculate values in a single row before writing to the target. Adjust Employee salaries Concatenate first and last names Convert string to numbers (Phone N0. 932- 1123-6789) Test conditional statements before passing data (Set output port for delayed payment etc.)
- 14. Ports Input orInput-output ports – For each value used in expression Output ports – Return value for the output port matches the return value of expression – Multiple Expressions using same set of Input data will have multiple Output ports for generating results
- 15. Example: Single OutputPort Input port – Unit Price – Units ordered Expression – Unit Price * Units Ordered Output Port – Total value of order
- 16. Example: Multiple OutputPort Input port – Employee Salary – Grade Expression – Income Tax Formula – PF Output Port – Income Tax amount – PF Amount
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- 27. Create Mapping touse Expression Transformation (Add Source & Targets)
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- 29. Link Ports (Manuallyand by Autolink)
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- 33. Run Mapping inDebugger
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- 36. Expression Transformation Exercise Useexpression Transformation to populate Product price (Order Amt / Quantity) If Order Amt > 10000 insert discount cd=1 else 0