PRIMARY KEY NULL CHECK

Primary key should not allow null values.But still we are checking primary key null check in ETL Testing.Why?

Interview Candidate
Apr 22nd, 2015
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Sumit M. Jha

Apr 28th, 2015

Primary key in the table is the unique identifier and is used to map the data. So, if primary key is null; then data cant be mapped with other table.

Pooja B.

Oct 11th, 2015

Because sometimes on database level the column (Primary key) is not defined as primary key, so in that case we need to check primary key for null values in ETL testing.