Description: Rowid is a unique identifier assigned to each row in a database. This concept is fundamental in database management as it allows developers and database administrators to access and manipulate data efficiently. In many database systems, each row of a table can have a rowid, which is a unique integer number generated automatically when a new row is inserted. This identifier can be used to perform search, update, and delete operations on records quickly and accurately. Additionally, the rowid can be used as a primary key, ensuring the uniqueness of each row within the table. While the use of rowid is common in SQLite, its concept can be found in other databases, where unique identifiers are used to facilitate data management. In summary, rowid is an essential feature that enhances the efficiency and organization of databases, allowing for quick and direct access to stored records.
History: The concept of rowid originated with the development of SQLite in 2000 by D. Richard Hipp. SQLite was designed as a lightweight, high-performance database, and the use of rowid was implemented to facilitate the identification and access of data rows. Over the years, SQLite has evolved and become one of the most widely used databases in various applications, maintaining rowid as a key feature in its design.
Uses: Rowid is primarily used in databases to uniquely identify each row in a table. This allows for efficient search, update, and delete operations on records. Additionally, rowid can be used in SQL queries to sort or filter results, thereby improving data management in applications that require quick access to information.
Examples: A practical example of using rowid is in a contact management system, where each contact is stored in a table. When adding a new contact, the database automatically assigns a rowid to that row, allowing the application to easily access and modify the contact’s information using its rowid. Another example is in an inventory database, where each product has a rowid that is used for quick searches and updates.
