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...
An avocation is an activity that you pursue when you're not at work â a hobby. Pretty much anything can be an avocation: tennis, sudoku, writing poetry. If you're the journalist Clark Kent, your avocation is changing into a skintight red and blue jumpsuit and fighting crime.