If you specify key range partitioning at a relational source qualifier, you can enter an additional filter condition. When you do this, the Integration Service generates a WHERE clause that includes the filter condition you enter in the session properties.
The filter condition you enter on the Transformations view of the Mapping tab overrides any filter condition that you set in the Designer when you configure the Source Qualifier transformation.
If you use key range partitioning, the filter condition works in conjunction with the key ranges. For example, you want to select data based on customer ID, but you do not want to extract information for customers outside the USA. Define the following key ranges:
If you know that the IDs for customers outside the USA fall within the range for a particular partition, you can enter a filter in that partition to exclude them. Therefore, you enter the following filter condition for the second partition:
CUSTOMERS.COUNTRY = ‘USA’
When the session runs, the following queries for the two partitions appear in the session log:
READER_1_1_1> RR_4010 SQ instance [SQ_CUSTOMERS] SQL Query [SELECT CUSTOMERS.CUSTOMER_ID, CUSTOMERS.COMPANY, CUSTOMERS.LAST_NAME FROM CUSTOMERS WHERE CUSTOMER.CUSTOMER ID < 135000]
READER_1_1_2> RR_4010 SQ instance [SQ_CUSTOMERS] SQL Query [SELECT CUSTOMERS.CUSTOMER_ID, CUSTOMERS.COMPANY, CUSTOMERS.LAST_NAME FROM CUSTOMERS WHERE CUSTOMERS.COUNTRY = ‘USA’ AND 135000 <= CUSTOMERS.CUSTOMER_ID]
To enter a filter condition, click the Browse button in the Source Filter field. Enter the filter condition in the SQL Editor dialog box, and then click OK.
If you entered a filter condition in the Designer when you configured the Source Qualifier transformation, that query appears in the Source Filter field for each partition. To override this filter, click the Browse button in the Source Filter field, change the filter condition in the SQL Editor dialog box, and then click OK.