I am using Oracle SQLDeveloper environment and need some assistance or guidance with the creation of the following:

Creation of an audit table which will be populated each time a books retail price or cost is changed. You should design the table and include fields to store the time the change was made as well as any other fields you feel would be helpful. Creation of a trigger to populate the audit table described above A function which returns the average retail price of all books in the books table A procedure which utilizes a cursor to update the retail price of all books in the books by a given percentage

Tables & Data: CREATE TABLE Customers (Customer# NUMBER(4), LastName VARCHAR2(10) NOT NULL, FirstName VARCHAR2(10) NOT NULL, Address VARCHAR2(20), City VARCHAR2(12), State VARCHAR2(2), Zip VARCHAR2(5), Referred NUMBER(4), Region CHAR(2), CONSTRAINT customers_customer#_pk PRIMARY KEY(customer#), CONSTRAINT customers_region_ck CHECK (region IN ('N', 'NW', 'NE', 'S', 'SE', 'SW', 'W', 'E')) ); INSERT INTO CUSTOMERS VALUES (1001, 'MORALES', 'BONITA', 'P.O. BOX 651', 'EASTPOINT', 'FL', '32328', NULL, 'SE'); INSERT INTO CUSTOMERS VALUES (1002, 'THOMPSON', 'RYAN', 'P.O. BOX 9835', 'SANTA MONICA', 'CA', '90404', NULL, 'W'); INSERT INTO CUSTOMERS VALUES (1003, 'SMITH', 'LEILA', 'P.O. BOX 66', 'TALLAHASSEE', 'FL', '32306', NULL, 'SE'); INSERT INTO CUSTOMERS VALUES (1004, 'PIERSON', 'THOMAS', '69821 SOUTH AVENUE', 'BOISE', 'ID', '83707', NULL, 'NW'); INSERT INTO CUSTOMERS VALUES (1005, 'GIRARD', 'CINDY', 'P.O. BOX 851', 'SEATTLE', 'WA', '98115', NULL, 'NW'); INSERT INTO CUSTOMERS VALUES (1006, 'CRUZ', 'MESHIA', '82 DIRT ROAD', 'ALBANY', 'NY', '12211', NULL, 'NE'); INSERT INTO CUSTOMERS VALUES (1007, 'GIANA', 'TAMMY', '9153 MAIN STREET', 'AUSTIN', 'TX', '78710', 1003, 'SW'); INSERT INTO CUSTOMERS VALUES (1008, 'JONES', 'KENNETH', 'P.O. BOX 137', 'CHEYENNE', 'WY', '82003', NULL, 'N'); INSERT INTO CUSTOMERS VALUES (1009, 'PEREZ', 'JORGE', 'P.O. BOX 8564', 'BURBANK', 'CA', '91510', 1003, 'W'); INSERT INTO CUSTOMERS VALUES (1010, 'LUCAS', 'JAKE', '114 EAST SAVANNAH', 'ATLANTA', 'GA', '30314', NULL, 'SE'); INSERT INTO CUSTOMERS VALUES (1011, 'MCGOVERN', 'REESE', 'P.O. BOX 18', 'CHICAGO', 'IL', '60606', NULL, 'N'); INSERT INTO CUSTOMERS VALUES (1012, 'MCKENZIE', 'WILLIAM', 'P.O. BOX 971', 'BOSTON', 'MA', '02110', NULL, 'NE'); INSERT INTO CUSTOMERS VALUES (1013, 'NGUYEN', 'NICHOLAS', '357 WHITE EAGLE AVE.', 'CLERMONT', 'FL', '34711', 1006, 'SE'); INSERT INTO CUSTOMERS VALUES (1014, 'LEE', 'JASMINE', 'P.O. BOX 2947', 'CODY', 'WY', '82414', NULL, 'N'); INSERT INTO CUSTOMERS VALUES (1015, 'SCHELL', 'STEVE', 'P.O. BOX 677', 'MIAMI', 'FL', '33111', NULL, 'SE'); INSERT INTO CUSTOMERS VALUES (1016, 'DAUM', 'MICHELL', '9851231 LONG ROAD', 'BURBANK', 'CA', '91508', 1010, 'W'); INSERT INTO CUSTOMERS VALUES (1017, 'NELSON', 'BECCA', 'P.O. BOX 563', 'KALMAZOO', 'MI', '49006', NULL, 'N'); INSERT INTO CUSTOMERS VALUES (1018, 'MONTIASA', 'GREG', '1008 GRAND AVENUE', 'MACON', 'GA', '31206', NULL, 'SE'); INSERT INTO CUSTOMERS VALUES (1019, 'SMITH', 'JENNIFER', 'P.O. BOX 1151', 'MORRISTOWN', 'NJ', '07962', 1003, 'NE'); INSERT INTO CUSTOMERS VALUES (1020, 'FALAH', 'KENNETH', 'P.O. BOX 335', 'TRENTON', 'NJ', '08607', NULL, 'NE'); CREATE TABLE Orders (Order# NUMBER(4), Customer# NUMBER(4), OrderDate DATE NOT NULL, ShipDate DATE, ShipStreet VARCHAR2(18), ShipCity VARCHAR2(15), ShipState VARCHAR2(2), ShipZip VARCHAR2(5), ShipCost NUMBER(4,2), CONSTRAINT orders_order#_pk PRIMARY KEY(order#), CONSTRAINT orders_customer#_fk FOREIGN KEY (customer#) REFERENCES customers(customer#)); INSERT INTO ORDERS VALUES (1000,1005,'31-MAR-09','02-APR-09','1201 ORANGE AVE', 'SEATTLE', 'WA', '98114' , 2.00); INSERT INTO ORDERS VALUES (1001,1010,'31-MAR-09','01-APR-09', '114 EAST SAVANNAH', 'ATLANTA', 'GA', '30314', 3.00); INSERT INTO ORDERS VALUES (1002,1011,'31-MAR-09','01-APR-09','58 TILA CIRCLE', 'CHICAGO', 'IL', '60605', 3.00); INSERT INTO ORDERS VALUES (1003,1001,'01-APR-09','01-APR-09','958 MAGNOLIA LANE', 'EASTPOINT', 'FL', '32328', 4.00); INSERT INTO ORDERS VALUES (1004,1020,'01-APR-09','05-APR-09','561 ROUNDABOUT WAY', 'TRENTON', 'NJ', '08601', NULL); INSERT INTO ORDERS VALUES (1005,1018,'01-APR-09','02-APR-09', '1008 GRAND AVENUE', 'MACON', 'GA', '31206', 2.00); INSERT INTO ORDERS VALUES (1006,1003,'01-APR-09','02-APR-09','558A CAPITOL HWY.', 'TALLAHASSEE', 'FL', '32307', 2.00); INSERT INTO ORDERS VALUES (1007,1007,'02-APR-09','04-APR-09', '9153 MAIN STREET', 'AUSTIN', 'TX', '78710', 7.00); INSERT INTO ORDERS VALUES (1008,1004,'02-APR-09','03-APR-09', '69821 SOUTH AVENUE', 'BOISE', 'ID', '83707', 3.00); INSERT INTO ORDERS VALUES (1009,1005,'03-APR-09','05-APR-09','9 LIGHTENING RD.', 'SEATTLE', 'WA', '98110', NULL); INSERT INTO ORDERS VALUES (1010,1019,'03-APR-09','04-APR-09','384 WRONG WAY HOME', 'MORRISTOWN', 'NJ', '07960', 2.00); INSERT INTO ORDERS VALUES (1011,1010,'03-APR-09','05-APR-09', '102 WEST LAFAYETTE', 'ATLANTA', 'GA', '30311', 2.00); INSERT INTO ORDERS VALUES (1012,1017,'03-APR-09',NULL,'1295 WINDY AVENUE', 'KALMAZOO', 'MI', '49002', 6.00); INSERT INTO ORDERS VALUES (1013,1014,'03-APR-09','04-APR-09','7618 MOUNTAIN RD.', 'CODY', 'WY', '82414', 2.00); INSERT INTO ORDERS VALUES (1014,1007,'04-APR-09','05-APR-09', '9153 MAIN STREET', 'AUSTIN', 'TX', '78710', 3.00); INSERT INTO ORDERS VALUES (1015,1020,'04-APR-09',NULL,'557 GLITTER ST.', 'TRENTON', 'NJ', '08606', 2.00); INSERT INTO ORDERS VALUES (1016,1003,'04-APR-09',NULL,'9901 SEMINOLE WAY', 'TALLAHASSEE', 'FL', '32307', 2.00); INSERT INTO ORDERS VALUES (1017,1015,'04-APR-09','05-APR-09','887 HOT ASPHALT ST', 'MIAMI', 'FL', '33112', 3.00); INSERT INTO ORDERS VALUES (1018,1001,'05-APR-09',NULL,'95812 HIGHWAY 98', 'EASTPOINT', 'FL', '32328', NULL); INSERT INTO ORDERS VALUES (1019,1018,'05-APR-09',NULL, '1008 GRAND AVENUE', 'MACON', 'GA', '31206', 2.00); INSERT INTO ORDERS VALUES (1020,1008,'05-APR-09',NULL,'195 JAMISON LANE', 'CHEYENNE', 'WY', '82003', 2.00); CREATE TABLE Publisher (PubID NUMBER(2), Name VARCHAR2(23), Contact VARCHAR2(15), Phone VARCHAR2(12), CONSTRAINT publisher_pubid_pk PRIMARY KEY(pubid)); INSERT INTO PUBLISHER VALUES(1,'PRINTING IS US','TOMMIE SEYMOUR','000-714-8321'); INSERT INTO PUBLISHER VALUES(2,'PUBLISH OUR WAY','JANE TOMLIN','010-410-0010'); INSERT INTO PUBLISHER VALUES(3,'AMERICAN PUBLISHING','DAVID DAVIDSON','800-555-1211'); INSERT INTO PUBLISHER VALUES(4,'READING MATERIALS INC.','RENEE SMITH','800-555-9743'); INSERT INTO PUBLISHER VALUES(5,'REED-N-RITE','SEBASTIAN JONES','800-555-8284'); CREATE TABLE Author (AuthorID VARCHAR2(4), Lname VARCHAR2(10), Fname VARCHAR2(10), CONSTRAINT author_authorid_pk PRIMARY KEY(authorid)); INSERT INTO AUTHOR VALUES ('S100','SMITH', 'SAM'); INSERT INTO AUTHOR VALUES ('J100','JONES','JANICE'); INSERT INTO AUTHOR VALUES ('A100','AUSTIN','JAMES'); INSERT INTO AUTHOR VALUES ('M100','MARTINEZ','SHEILA'); INSERT INTO AUTHOR VALUES ('K100','KZOCHSKY','TAMARA'); INSERT INTO AUTHOR VALUES ('P100','PORTER','LISA'); INSERT INTO AUTHOR VALUES ('A105','ADAMS','JUAN'); INSERT INTO AUTHOR VALUES ('B100','BAKER','JACK'); INSERT INTO AUTHOR VALUES ('P105','PETERSON','TINA'); INSERT INTO AUTHOR VALUES ('W100','WHITE','WILLIAM'); INSERT INTO AUTHOR VALUES ('W105','WHITE','LISA'); INSERT INTO AUTHOR VALUES ('R100','ROBINSON','ROBERT'); INSERT INTO AUTHOR VALUES ('F100','FIELDS','OSCAR'); INSERT INTO AUTHOR VALUES ('W110','WILKINSON','ANTHONY'); CREATE TABLE Books (ISBN VARCHAR2(10), Title VARCHAR2(30), PubDate DATE, PubID NUMBER (2), Cost NUMBER (5,2), Retail NUMBER (5,2), Discount NUMBER (4,2), Category VARCHAR2(12), CONSTRAINT books_isbn_pk PRIMARY KEY(isbn), CONSTRAINT books_pubid_fk FOREIGN KEY (pubid) REFERENCES publisher (pubid)); INSERT INTO BOOKS VALUES ('1059831198','BODYBUILD IN 10 MINUTES A DAY','21-JAN-05',4,18.75,30.95, NULL, 'FITNESS'); INSERT INTO BOOKS VALUES ('0401140733','REVENGE OF MICKEY','14-DEC-05',1,14.20,22.00, NULL, 'FAMILY LIFE'); INSERT INTO BOOKS VALUES ('4981341710','BUILDING A CAR WITH TOOTHPICKS','18-MAR-06',2,37.80,59.95, 3.00, 'CHILDREN'); INSERT INTO BOOKS VALUES ('8843172113','DATABASE IMPLEMENTATION','04-JUN-03',3,31.40,55.95, NULL, 'COMPUTER'); INSERT INTO BOOKS VALUES ('3437212490','COOKING WITH MUSHROOMS','28-FEB-04',4,12.50,19.95, NULL, 'COOKING'); INSERT INTO BOOKS VALUES ('3957136468','HOLY GRAIL OF ORACLE','31-DEC-05',3,47.25,75.95, 3.80, 'COMPUTER'); INSERT INTO BOOKS VALUES ('1915762492','HANDCRANKED COMPUTERS','21-JAN-05',3,21.80,25.00, NULL, 'COMPUTER'); INSERT INTO BOOKS VALUES ('9959789321','E-BUSINESS THE EASY WAY','01-MAR-06',2,37.90,54.50, NULL, 'COMPUTER'); INSERT INTO BOOKS VALUES ('2491748320','PAINLESS CHILD-REARING','17-JUL-04',5,48.00,89.95, 4.50, 'FAMILY LIFE'); INSERT INTO BOOKS VALUES ('0299282519','THE WOK WAY TO COOK','11-SEP-04',4,19.00,28.75, NULL, 'COOKING'); INSERT INTO BOOKS VALUES ('8117949391','BIG BEAR AND LITTLE DOVE','08-NOV-05',5,5.32,8.95, NULL, 'CHILDREN'); INSERT INTO BOOKS VALUES ('0132149871','HOW TO GET FASTER PIZZA','11-NOV-06',4,17.85,29.95, 1.50, 'SELF HELP'); INSERT INTO BOOKS VALUES ('9247381001','HOW TO MANAGE THE MANAGER','09-MAY-03',1,15.40,31.95, NULL, 'BUSINESS'); INSERT INTO BOOKS VALUES ('2147428890','SHORTEST POEMS','01-MAY-05',5,21.85,39.95, NULL, 'LITERATURE'); CREATE TABLE ORDERITEMS ( Order# NUMBER(4), Item# NUMBER(2), ISBN VARCHAR2(10), Quantity NUMBER(3) NOT NULL, PaidEach NUMBER(5,2) NOT NULL, CONSTRAINT orderitems_pk PRIMARY KEY (order#, item#), CONSTRAINT orderitems_order#_fk FOREIGN KEY (order#) REFERENCES orders (order#) , CONSTRAINT orderitems_isbn_fk FOREIGN KEY (isbn) REFERENCES books (isbn) , CONSTRAINT oderitems_quantity_ck CHECK (quantity > 0) ); INSERT INTO ORDERITEMS VALUES (1000,1,'3437212490',1,19.95); INSERT INTO ORDERITEMS VALUES (1001,1,'9247381001',1,31.95); INSERT INTO ORDERITEMS VALUES (1001,2,'2491748320',1,85.45); INSERT INTO ORDERITEMS VALUES (1002,1,'8843172113',2,55.95); INSERT INTO ORDERITEMS VALUES (1003,1,'8843172113',1,55.95); INSERT INTO ORDERITEMS VALUES (1003,2,'1059831198',1,30.95); INSERT INTO ORDERITEMS VALUES (1003,3,'3437212490',1,19.95); INSERT INTO ORDERITEMS VALUES (1004,1,'2491748320',2,85.45); INSERT INTO ORDERITEMS VALUES (1005,1,'2147428890',1,39.95); INSERT INTO ORDERITEMS VALUES (1006,1,'9959789321',1,54.50); INSERT INTO ORDERITEMS VALUES (1007,1,'3957136468',3,72.15); INSERT INTO ORDERITEMS VALUES (1007,2,'9959789321',1,54.50); INSERT INTO ORDERITEMS VALUES (1007,3,'8117949391',1,8.95); INSERT INTO ORDERITEMS VALUES (1007,4,'8843172113',1,55.95); INSERT INTO ORDERITEMS VALUES (1008,1,'3437212490',2,19.95); INSERT INTO ORDERITEMS VALUES (1009,1,'3437212490',1,19.95); INSERT INTO ORDERITEMS VALUES (1009,2,'0401140733',1,22.00); INSERT INTO ORDERITEMS VALUES (1010,1,'8843172113',1,55.95); INSERT INTO ORDERITEMS VALUES (1011,1,'2491748320',1,85.45); INSERT INTO ORDERITEMS VALUES (1012,1,'8117949391',1,8.95); INSERT INTO ORDERITEMS VALUES (1012,2,'1915762492',2,25.00); INSERT INTO ORDERITEMS VALUES (1012,3,'2491748320',1,85.45); INSERT INTO ORDERITEMS VALUES (1012,4,'0401140733',1,22.00); INSERT INTO ORDERITEMS VALUES (1013,1,'8843172113',1,55.95); INSERT INTO ORDERITEMS VALUES (1014,1,'0401140733',2,22.00); INSERT INTO ORDERITEMS VALUES (1015,1,'3437212490',1,19.95); INSERT INTO ORDERITEMS VALUES (1016,1,'2491748320',1,85.45); INSERT INTO ORDERITEMS VALUES (1017,1,'8117949391',2,8.95); INSERT INTO ORDERITEMS VALUES (1018,1,'3437212490',1,19.95); INSERT INTO ORDERITEMS VALUES (1018,2,'8843172113',1,55.95); INSERT INTO ORDERITEMS VALUES (1019,1,'0401140733',1,22.00); INSERT INTO ORDERITEMS VALUES (1020,1,'3437212490',1,19.95); CREATE TABLE BOOKAUTHOR (ISBN VARCHAR2(10), AuthorID VARCHAR2(4), CONSTRAINT bookauthor_pk PRIMARY KEY (isbn, authorid), CONSTRAINT bookauthor_isbn_fk FOREIGN KEY (isbn) REFERENCES books (isbn), CONSTRAINT bookauthor_authorid_fk FOREIGN KEY (authorid) REFERENCES author (authorid)); INSERT INTO BOOKAUTHOR VALUES ('1059831198','S100'); INSERT INTO BOOKAUTHOR VALUES ('1059831198','P100'); INSERT INTO BOOKAUTHOR VALUES ('0401140733','J100'); INSERT INTO BOOKAUTHOR VALUES ('4981341710','K100'); INSERT INTO BOOKAUTHOR VALUES ('8843172113','P105'); INSERT INTO BOOKAUTHOR VALUES ('8843172113','A100'); INSERT INTO BOOKAUTHOR VALUES ('8843172113','A105'); INSERT INTO BOOKAUTHOR VALUES ('3437212490','B100'); INSERT INTO BOOKAUTHOR VALUES ('3957136468','A100'); INSERT INTO BOOKAUTHOR VALUES ('1915762492','W100'); INSERT INTO BOOKAUTHOR VALUES ('1915762492','W105'); INSERT INTO BOOKAUTHOR VALUES ('9959789321','J100'); INSERT INTO BOOKAUTHOR VALUES ('2491748320','R100'); INSERT INTO BOOKAUTHOR VALUES ('2491748320','F100'); INSERT INTO BOOKAUTHOR VALUES ('2491748320','B100'); INSERT INTO BOOKAUTHOR VALUES ('0299282519','S100'); INSERT INTO BOOKAUTHOR VALUES ('8117949391','R100'); INSERT INTO BOOKAUTHOR VALUES ('0132149871','S100'); INSERT INTO BOOKAUTHOR VALUES ('9247381001','W100'); INSERT INTO BOOKAUTHOR VALUES ('2147428890','W105'); CREATE TABLE promotion (Gift varchar2(15), Minretail number(5,2), Maxretail number(5,2)); INSERT into promotion VALUES ('BOOKMARKER', 0, 12); INSERT into promotion VALUES ('BOOK LABELS', 12.01, 25); INSERT into promotion VALUES ('BOOK COVER', 25.01, 56); INSERT into promotion VALUES ('FREE SHIPPING', 56.01, 999.99); COMMIT; CREATE TABLE acctmanager (amid VARCHAR2(4) PRIMARY KEY, amfirst VARCHAR2(12) NOT NULL, amlast VARCHAR2(12) NOT NULL, amedate DATE DEFAULT SYSDATE, region CHAR(2) NOT NULL); CREATE TABLE acctmanager2 (amid CHAR(4), amfirst VARCHAR2(12) NOT NULL, amlast VARCHAR2(12) NOT NULL, amedate DATE DEFAULT SYSDATE, region CHAR(2), CONSTRAINT acctmanager2_amid_pk PRIMARY KEY (amid), CONSTRAINT acctmanager2_region_ck CHECK (region IN ('N', 'NW', 'NE', 'S', 'SE', 'SW', 'W', 'E')));