Can we override the lookup SQL query for flat file lookups?
Christopher Lucas Can we override the lookup SQL query for flat file lookups?
You can override the lookup SQL query for relational lookups. If you override the lookup query, you must also enable lookup caching for the transformation.
Can we write lookup override for flat file?
A Lookup transformation can used to look up data in a flat file, relational table, view, or synonym. You can import a lookup definition from any flat file or relational database to which both the PowerCenter Client and Integration Service can connect.
What is SQL override in Informatica?
SQL Override in Informatica When you override the default SQL query for a session configured for pushdown optimization, the Integration Service creates a view to represent the SQL override. It then runs an SQL query against this view to push the transformation logic to the database.
Can we join a flat file and table in Informatica?
Example : An Oracle table and a DB2 table, A flat file and database table, Two flat files. If you can perform a join on the source database, then you can configure it in the Source Qualifier. The Joiner Transformation in Informatica supports the following types of Joins. Normal>>>EQUI JOIN.
What is difference between SQL override and lookup override in Informatica?
The role of SQL Override is to limit the number of incoming rows entering the mapping pipeline, whereas Lookup Override is used to limit the number of lookup rows to avoid the whole table scan by saving the lookup time and the cache it uses. Lookup Override provides only Non-Equi joins.
Can we use with clause in lookup override?
Using WITH AS() in a Lookup Override It works fine outside of PowerCenter.
Why lookup transformation is used in Informatica?
Use a Lookup transformation to retrieve data based on a specified lookup condition. For example, you can use a Lookup transformation to retrieve values from a database table for codes used in source data.
Can we do SQL override in Joiner transformation?
Some of the difference between the Joiner transformation and Join of the SQL override in Source Qualifier transformation are the following: You can join heterogeneous data sources using the Joiner transformation which is not possible in a Source Qualifier transformation.
What is Master outer join in Informatica?
Master outer join. In Master outer join, all records from the Detail source are returned by the join and only matching rows from the master source are returned. Detail outer join. In detail outer join only matching rows are returned from the detail source, and all rows from the master source are returned.
What is the difference between mapping and mapplet?
Mapping is developed with different transformation but not reusable. Mapplet can be reused other mapping and also mapplet. Mapping is developed for what data move to target, what modification done upon that. Mapplet is developed for complex calculation used in multiple mappings.
What is mapplet and Worklet in Informatica?
Mapplet is used for creation and configuration of a group of transformation. A worklet is an object by combining the set of tasks to build a workflow logic.It can be reusable in multiple workflows, which can be configured to run concurrently.
Which transformations support SQL overrides?
The most common transformations which support the SQL overrides are Source Qualifier & Lookup transformations. If a table name or column name in the lookup query contains a reserved word, enclose the reserved word in quotes.
How to generate an SQL query in Informatica?
Enter the ODBC data source name, user name, password and then click on Generate SQL. Now we will get the error while generating the SQL query. Informatica produces this error because the source qualifier transformation ports are not connected to any other transformations or target.
Why does Informatica produce this error when using qualifier transformation ports?
Informatica produces this error because the source qualifier transformation ports are not connected to any other transformations or target. Informatica just knows the structure of the source. However it doesn’t know what columns to be read from source table.
How do you override the default query in SQL Server?
Source Qualifier SQL Override The Source Qualifier transformation provides the SQL Query option to override the default query. We can use a parameter or variable as the SQL query or include parameters and variables within the query. The SELECT statement must list the port names in the order in which they appear in the transformation.
