1.2.10. Relational algebra/model notation

  • Relational schema R(A1, A2,…,An)
  • Relation state r or r(R)
    • Set of unordered tuples
    • r = {t1, t2,…,tn}
  • Each n-tuple is an ordered list of values
    • t = <v1, v2,…,vn>
  • ith value in t = vi called t[Ai]
  • r(R) subset of (dom(A1) x dom(A2)... x dom(An))