Help me with PL/SQL please!!! Following is the script:

DROP TABLE S; DROP TABLE P; DROP TABLE SP; CREATE TABLE S( S# VARCHAR(2) NOT NULL, SNAME VARCHAR(5), STATUS NUMBER(2), CITY VARCHAR(6), CONSTRAINT S_S#_PK PRIMARY KEY (S#)); CREATE TABLE P( P# VARCHAR(2) NOT NULL, PNAME VARCHAR(5), COLOR VARCHAR(5), WEIGHT FLOAT, CITY VARCHAR(6), CONSTRAINT P_P#_PK PRIMARY KEY(P#)); CREATE TABLE SP( S# VARCHAR(2) NOT NULL, P# VARCHAR(2) NOT NULL, QTY NUMBER(3), CONSTRAINT SP_S#_P#_PK PRIMARY KEY (S#, P#) , CONSTRAINT SP_S#_FK FOREIGN KEY (S#) REFERENCES S(S#), CONSTRAINT SP_P#_FK FOREIGN KEY (P#) REFERENCES P(P#) ); /* grant select on S to public; grant select on P to public; grant select on SP to public; */ insert into s values ( 'S1','Smith',20,'London'); insert into s values ( 'S2','Jones',10,'Paris'); insert into s values ( 'S3','Black',30,'Paris'); insert into s values ( 'S4','Clark',20,'London'); insert into s values ( 'S5','Adams',30,'Athens'); insert into p values ( 'P1','Nut','Red',12,'London'); insert into p values ( 'P2','Bolt','Green',17,'Paris'); insert into p values ( 'P3','Screw','Blue',17,'Rom'); insert into p values ( 'P4','Screw','Red',14,'London'); insert into p values ( 'P5','Cam','Blue',12,'Paris'); insert into p values ( 'P6','Cog','Red',19,'London'); insert into sp values ( 'S1','P1',300); insert into sp values ( 'S1','P2',200); insert into sp values ( 'S1','P3',400); insert into sp values ( 'S1','P4',200); insert into sp values ( 'S1','P5',100); insert into sp values ( 'S1','P6',100); insert into sp values ( 'S2','P1',300); insert into sp values ( 'S2','P2',400); insert into sp values ( 'S3','P2',200); insert into sp values ( 'S4','P2',200); insert into sp values ( 'S4','P4',300); insert into sp values ( 'S4','P5',400);

Please help us using SQL on:

1. Give the max number of unique parts supplied by every supplier

2. Give the subtotals of the total part weights of the all the parts supplied by a supplier and give the

final total weight

And using PL/SQL:

1. Give the top 2 and bottom 2 parts based on their quantity.

5. Give the supplier and part that come from the same city

10. Give the suppliers that are not from the city from which smith is.

15. Give the total quantity supplied by each supplier and his name

20. Give the supplier name that supplies the minimum quantity of parts

25. Give the max number of unique parts supplied by every supplier

30. Give the subtotals of the total part weights of the all the parts supplied by a supplier and give the

final total weight

Thank you very much