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...
â¢ VAR. (noun). The noun VAR. has 1 sense: 1. (biology) a group of organisms within a species that differ in trivial ways from similar groups. Familiarity information: VAR. used as a noun is very rare. VAR. (noun). The noun VAR. has 1 sense: 1. (biology) a group of organisms within a species that differ in trivial ways from similar groups. Familiarity information: VAR. used as a noun is very rare.