i) Print PCODE values for parts supplied to any project in DEHLI by a supplier in DELHI.
SELECT PCODE FROM SPPR, PROJECTS, SUPPLIER WHERE PROJECTS.PRCITY="DELHI" AND SUPPLIER.CITY="DELHI" AND SPPR.PRCODE = PROJECTS.PRCODE AND SPPR.SCODE = SUPPLIER.SCODE;
ii) Print all triples <CITY, PCODE, CITY> such that a supplier in first city supplies the specified part to a project in the second city, but do not print the triples in which the two CITY values are same.
SELECT SUPPLIER.CITY, SPPR.PCODE, PROJECTS.PRCITY FROM SUPPLIER, SPPR, PROJECTS WHERE SUPPLIER.CITY <> PROJECTS.PRCITY AND SUPPLIER.SCODE = SPPR.SCODE AND PROJECTS.PRCODE = SPPR.PRCODE;