1CREATE TABLE data ( 2 subject TEXT NOT NULL, 3 predicate TEXT NOT NULL, 4 object TEXT NOT NULL, 5 graph TEXT NOT NULL 6); 7 8-- index for subject-primary retrieval (index prefixes: s, sp) 9CREATE INDEX idx_spo ON data(lower(subject), lower(predicate), lower(object)); 10 11-- index for predicate-primary retrieval (i.e. property fetch) 12CREATE INDEX idx_pso ON data(lower(predicate), lower(subject), lower(object)); 13