Key Fields in a Database. Keys are crucial to a table structure for many reasons, some of which are identified below: 1  They ensure that each record in a table is precisely identified.  They help establish and enforce various types of integrity.
avifauna definition: The definition of avifauna are the birds that live in a certain place or at a certain time. (noun) An example of avifauna is penguins living primarily in Antarctica. An example of avifauna is the moa of New Zealand becoming extin...
Varna (à¤µà¤°à¥à¤£) is a Sanskrit word which means character, quality or nature. Due to the polysemic nature of Sanskrit, one word can have many meanings. Varna can also mean colour or class. Ancient Hindu literature classified all humankind, and all created beings, in principle into four varnas: