Q

Integer or character primary key

I have a table with a primary key (PK), which was naturally defined as an integer number from my business model. Do I have to keep this PK as an integer or could I use a char/varchar data type? Considering that the values for PK will not be greater than 500000, using varchar(6) could save some space. Does it affect indexing or querying?
This was first published in August 2004

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