CREATE TABLE person (name CLOB, age NUMBER, city CLOB, gender CLOB, job CLOB)
CREATE TABLE personfriend (name CLOB, friend CLOB, year NUMBER)

HOw many engineers are older than 30?
SELECT COUNT(*) FROM person WHERE age > 30 AND job = 'engineer'
SELECT COUNT(*) FROM "person" WHERE "age" > 30 AND "job" = 'engineer'