<P> This model organizes data into one or more tables ( or `` relations '' ) of columns and rows , with a unique key identifying each row . Rows are also called records or tuples . Columns are also called attributes . Generally , each table / relation represents one `` entity type '' ( such as customer or product ) . The rows represent instances of that type of entity ( such as `` Lee '' or `` chair '' ) and the columns representing values attributed to that instance ( such as address or price ) . </P>
<P> This model organizes data into one or more tables ( or `` relations '' ) of columns and rows , with a unique key identifying each row . Rows are also called records or tuples . Columns are also called attributes . Generally , each table / relation represents one `` entity type '' ( such as customer or product ) . The rows represent instances of that type of entity ( such as `` Lee '' or `` chair '' ) and the columns representing values attributed to that instance ( such as address or price ) . </P>
in a relational database a record is also called a ( n )
in a relational database a record is also called a ( n )
Rows tuples
Rows tuples