primaarvõtmed
Primaarvõtmed, or primary keys, are fundamental concepts in relational database design. A primary key is a column or a set of columns in a table that uniquely identifies each row. This means that no two rows in the table can have the same value or combination of values in the primary key column(s). The primary key is essential for maintaining data integrity and ensuring that each record can be unambiguously accessed and referenced.
The establishment of a primary key serves several crucial purposes. Firstly, it guarantees entity integrity, preventing
Primary keys are typically chosen to be a single column with a unique identifier, such as an