Description: A unique row in an SQL table refers to an entry that is uniquely identified by a key, commonly known as a primary key. This key is an attribute or a set of attributes that ensures that each row in the table is unique, meaning that there cannot be two rows with the same value in the column or columns that make up the primary key. The implementation of unique rows is fundamental to maintaining data integrity in a relational database, as it allows for precise identification of records and prevents duplication of information. Additionally, unique rows facilitate the creation of relationships between different tables, as other tables can refer to the primary key of one table to establish links. In terms of database design, it is essential to correctly define unique rows from the outset to ensure an efficient and coherent data model. Unique rows are not only important for data integrity but also optimize queries and improve the overall performance of the database, as indexes can be created on these keys to speed up data access.
