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...
vaâ¢giâ¢na. 1. a. the passage leading from the uterus to the vulva in female mammals. b. a sheathlike part or organ. 2. the sheath at the base of a leaf where it surrounds the stalk, as in grasses.