day : 07/08/2018 1 result

Avoiding Duplication Of Records

The issue of avoiding duplicate records in relational databases is one of the most common issues or problems. The primary mechanism to prevent that are the primary keys, however, in many databases or tables, primary keys are not defined. We are not going to discuss if not having a primary key is unacceptable or acceptable under the specific circumstance. We know that occurs, especially on data warehouses schemas. Then, in this environment where we don’t have primary keys or unique constraints ...