consider the following schema: suppliers(sid: integer, sname: string, address: string) parts(pid: integer, pname: string, color: string) catalog(sid: integer, pid: integer, cost: real) write sql statements to answer the following questions: 1. list the values of column pname of all parts for which there is some supplier. 2. list the values of column sname for all suppliers who supply every part. 3. list the values of column sname for all suppliers who supply every red part