A group of organisms of the same species, having distinctive characteristics but not usually considered a separate breed or variety: a superior strain of wheat; a smooth strain of bacteria.
A relation refers to a table and a row in a table corresponds to a tuple (is a collection of facts) in relational algebra.The term in this model refers to a two-dimentional table of data.
The term 'relation' has several uses: 1: a person related by blood or marriage; 2: (law) the principle that an act done at a later time is deemed by law to have occurred at an earlier time; 3: an...