Primärschlüsselwerten

Primärschlüsselwerten refer to the specific values assigned to a primary key in a database table. A primary key is a column or a set of columns that uniquely identifies each record within that table. Therefore, each primary key value must be unique and non-null. These values serve as the definitive identifier for any given row, allowing for efficient retrieval, modification, and deletion of specific data records. When data is inserted into a table, the primary key column(s) must be populated with a value that does not already exist in the table. This ensures data integrity and prevents duplicate entries. In some cases, primary keys are auto-generated, meaning the database system automatically assigns a unique value for each new record, often an incrementing integer. The primärschlüsselwerten are crucial for establishing relationships between different tables in a relational database, as they are often referenced by foreign keys in other tables. The uniqueness of primärschlüsselwerten is a fundamental principle for maintaining the accuracy and consistency of data within a database system.