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...
Definition of henna. 1  1 : a reddish-brown dye obtained from leaves of the henna plant and used especially on hair and in temporary tattoos. 2  2 : an Old World tropical shrub or small tree (Lawsonia inermis) of the loosestrife family with small opposite leaves and panicles of fragrant usually white flowers.