PK allows null values in progress DB does this reduce performance of sql statements?

5 pts.
Tags:
NULL values in PK
SQL performance
SQL statements
Hello Primary Key allows null values in progress DataBase, does this reduce performance of sql statements??
ASKED: February 27, 2009  1:50 PM
UPDATED: February 27, 2009  2:54 PM

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I’m reading a <a href=”http://www.progress.com/progress/products/documentation/docs/database/dbd/dbd.pdf”>Progress documentation pdf</a> and it says:

“7.1.2 PRIMARY Constraint
Use this constraint to name one or more columns to uniquely identify a row in a table. There can
only be one primary key for a table. <b><i>These columns cannot contain null values</i></b>.”

However, if null values were allowed, I don’t think it could affect performance, because in any case, the combination of all primary key fields in compound keys should be unique. Is there a specific reason why you think that could happen ?

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