- 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))
In Focus
1.2.10. Relational algebra/model notation