Index[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] referenced relvar referencing relvar referential action referential integrity metaconstraint relation 2nd pictured as table 2nd 3rd versus relvar versus type relation constant relation equality relation selector relation type inference name RELATION type generator RELATION {H} relation-valued attribute 2nd 3rd relational algebra 2nd relational assignment 2nd 3rd not in SQL relational calculus 2nd relational comparisons relational completeness relational model formal definition informal definition objectives versus other models relations, tuples, and attributes relcon relvar base versus stored versus file versus relation versus type relvar constraint the (total) relvar constraint relvar predicate relvar reference RENAME repeating group restrict 2nd Reuter, Andreas 2nd routine (SQL) row ID row type (SQL) row type constructor (SQL) row value constructor (SQL) rules of inference Russell, Bertrand |