<prompt> Hlalosa hore na senotlolo sa mantlha ke sefe polokelong ea litaba tsa likamano.nan  <response>: Instruction in English: Explain what primary key is in a relational database. . Response in English: A primary key is an essential element of a relational database, as it serves as a unique identifier for each record or row within a table. It consists of a single column or a combination of columns that contain values with unique characteristics, ensuring that duplicate entries or records do not exist within the table.Having a primary key allows for efficient data retrieval, as it enables database management systems to quickly search for and locate specific data sets or records within large and complex data tables. It also helps maintain data integrity and consistency, as the primary key acts as a reference point for establishing relationships between multiple tables within a database.Overall, the primary key plays a crucial role in organizing and managing data within a relational database, ensuring that data is stored, accessed and manipulated in a structured and efficient manner. . Response in Sesotho: Senotlolo sa mantlha ke karolo ea bohlokoa ea polokelo ea likamano, kaha e sebetsa e le sesupo se ikhethileng bakeng sa rekoto kapa mola o mong le o mong ka hara tafole. E na le kholomo e le ngoe kapa motsoako oa litšiea tse nang le litekanyetso tse nang le litšobotsi tse ikhethang, tse netefatsang hore litlaleho tse peli kapa lirekoto ha li eo ka hara tafole. Ho ba le senotlolo sa mantlha ho lumella ho khutlisa data hantle, kaha ho nolofalletsa litsamaiso tsa taolo ea database ho batla ka potlako le ho fumana li-sete kapa lirekoto tse ikhethileng ka hara litafole tse kholo le tse rarahaneng tsa data. E boetse e thusa ho boloka botšepehi ba data le botsitso, kaha senotlolo sa mantlha se sebetsa e le sebaka sa boitsoaro bakeng sa ho theha likamano lipakeng tsa litafole tse ngata ka hara database. Ka kakaretso, senotlolo sa mantlha se bapala karolo ea bohlokoa ho hlophiseng le ho tsamaisa data ka hara database ea likamano, ho netefatsa hore data ea bolokoa, ea fihlelleha le ho sebelisoa ka mokhoa o hlophisitsoeng le o sebetsang. 