ETL Testing

Source table has 1000 records. Only 900 records are loaded in to target table. What is the test approach to find the missing records?

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  • May 10th, 2016

If both source and target table are of same DB( Teradata/Oracle/DB2) with same table structure MINUS query can be used, as
Select * from SOURCE TABLE MINUS Select * from TARGET TABLE.
Else if table structure differs, and both table uses the same column as its key column, MINUS can be applied on the key column to find the difference
Select Key column from SOURCE TABLE MINUS Select Key column from TARGET TABLE.

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