Database Models and Relational Algebra – Part 6

Expressions or Formulas The general expression of the tuple relational calculus is of the subsequent form: { t1.A1, t2·A2, tn·An, I COND (t1, t2 … tn, tn+j, 1n+2…. tn+m ) } here, t1, t2, 1n, 1n+2, tn+m are tuple variables, each An is an attribute or column of the table or relation on which the ranges as well as COND…