mercredi 22 avril 2015

Implementing database constraints that are not possible to ensure with the DDL of RDBMS

This is a homework question, but it doesn't particularly make sense to me:

"How will you implement the constraints for your database that will not be possible to ensure with the mechanism of the Data Definition Language of RDBMS".

Aren't all constraints defined by the DDL when you're creating the tables?

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