Needing assitance getting orders in last 2 quarters - mysql

Question

I am new to sql and need help with a problem. Can anyone please help?
For each customer with orders in the last two quarters of the previous year, display their total extended cost for each of the last two quarters of the previous year.
A quarter of a year is 3 months- the first quarter is months 1, 2, 3; the second quarter is months 4, 5, 6; the third quarter is months 7, 8, 9; the fourth quarter is months 10, 11, 12. The result set should display one row per customer; the first column is the customer id, the second is the total for quarter 3 and the third column is the total for quarter 4. Display 0 if there are no sales for that customer in that quarter.
Select cust_id
, ifnull(Quarter1, 0) as Quarter1
, ifnull(Quarter2, 0) as Quarter2
FROM a_bkorders.customers
a_bkorders.order_headers using (cust_id)
Join a_bkorders.order_details using (order_id)
where order_id IN
(
Select order_id
FROM a_bkorders.order_details
GROUP BY order_id
Having QUARTER(orders)=
(
Select QUARTER(orders)=1 as Quarter1
, QUARTER(orders)=2 as Quarter2
From(
Select order_id
, sum(order_price * quantity) as orders
FROM a_bkorders.order_details
)tbl
)
);
HERE ARE THE TABLES:
-- create customers
create table a_bkorders.customers (
cust_id integer not null
, cust_name_last varchar(20) not null
, cust_name_first varchar(20) null
, cust_state char(2) not null
, cust_postal_code char(10) not null
, cust_acct_opened date not null
, constraint bk_cust_pk primary key (cust_id)
, constraint bk_cust_id_range check (cust_id > 1000)
, constraint bk_cust_acct_opened_ck check (cust_acct_opened >= '1975-01-01' )
)engine = INNODB;
-- create order_headers
create table a_bkorders.order_headers (
order_id integer not null
, order_date date not null
, cust_id integer not null
, constraint bk_orders_pk primary key (order_id)
, constraint bk_orders_cust_fk foreign key(cust_id)
references a_bkorders.customers(cust_id)
, constraint bk_order_id_range check (order_id > 100)
, constraint bk_order_date_ck check (order_date >= '2000-01-01')
)engine = INNODB;
-- create order_details
create table a_bkorders.order_details (
order_id integer not null
, order_line integer not null
, book_id integer not null
, quantity integer not null
, order_price numeric(6,2) not null
, constraint bk_orderline_pk primary key (order_id, order_line)
, constraint bk_orderline_order_fk foreign key (order_id)
references a_bkorders.order_headers(order_id) on delete cascade
, constraint bk_orderline_book_fk foreign key (book_id )
references a_bkinfo.books(book_id)
, constraint bk_quantity_ck check (quantity > 0)
, constraint bk_ordprice_ck check (order_price >= 0)
)engine = INNODB;
HERE ARE SOME INSERTS:
-- customers
insert into a_bkorders.customers values (208950, 'Adams', 'Samuel', 'MA', '02106', '1996-04-15' );
insert into a_bkorders.customers values (200368, 'Blake', 'William', 'CA', '95959', '1997-07-15' );
insert into a_bkorders.customers values (258595, 'Jobs', 'Peter', 'MA', '02575', '1997-01-09' );
insert into a_bkorders.customers values (263119, 'Jones', null, 'IL', '62979', '1997-03-02' );
insert into a_bkorders.customers values (224038, 'Austin', 'Pat', 'CA', '95900', '1997-08-02' );
insert into a_bkorders.customers values (255919, 'Milton', 'John', 'NJ', '08235', '2011-05-31' );
insert into a_bkorders.customers values (211483, 'Carroll', 'Lewis', 'CA', '94203', '1998-08-08' );
insert into a_bkorders.customers values (221297, 'Dodgson', 'Charles', 'MI', '49327', '2001-05-06' );
insert into a_bkorders.customers values (261502, 'Hawthorne', 'Nathaniel', 'MA', '02297', '2001-10-12' );
insert into a_bkorders.customers values (212921, 'Books on Tap', NULL, 'CA', '94112', '2002-01-06' );
insert into a_bkorders.customers values (260368, 'Muller', 'Jonathan', 'IL', '62885', '2005-12-15' );
insert into a_bkorders.customers values (259969, 'Carlsen', 'Benny', 'NJ', '08505', '2011-07-12' );
insert into a_bkorders.customers values (239427, 'Marksa', 'Anna', 'NJ', '08495', '2011-02-28' );
insert into a_bkorders.customers values (296598, 'Collins', 'Douglas', 'MO', '65836', '2005-04-25' );
insert into a_bkorders.customers values (276381, 'Collins', 'Douglas', 'OH', '22451', '2005-02-08' );
insert into a_bkorders.customers values (234138, 'Keats', 'John', 'IL', '61500', '2006-04-30' );
insert into a_bkorders.customers values (267780, 'Shelly', 'Mary', 'CA', '94100', '2010-10-02' );
insert into a_bkorders.customers values (290298, 'Swift', 'Jonathan', 'MI', '49201', '2010-10-12' );
insert into a_bkorders.customers values (226656, 'Randall', 'Randell', 'NJ', '08251', '2011-08-08' );
insert into a_bkorders.customers values (222477, 'Rossetti', 'Christina', 'MI', '49742', '2011-07-11' );
insert into a_bkorders.customers values (227105, 'Kafka', 'Franz', 'MA', '02297', '2010-12-31' );
insert into a_bkorders.customers values (202958, 'Denver', null, 'IL', '60405', '2011-01-15' );
insert into a_bkorders.customers values (218709, 'Bonnard', 'Paul', 'MA', '02558', '2005-11-15' );
insert into a_bkorders.customers values (217796, 'Anders', null, 'IL', '62505', '2011-03-30' );
insert into a_bkorders.customers values (272787, 'Carlson', 'Ben', 'IL', '62505', '2011-05-05' );
insert into a_bkorders.customers values (234709, 'Brahms', 'Johnnie', 'MA', '02558', '2012-01-15' );
insert into a_bkorders.customers values (217002, 'Grieg', 'Edvard', 'IL', '62329', '2012-02-29' );
insert into a_bkorders.customers values (272611, 'Jarrett', 'Keith', 'IL', '62329', '2011-11-11' );
insert into a_bkorders.customers values (299099, 'Sam', 'Dave', 'CA', '94141', '2011-01-01' );
insert into a_bkorders.customers values (259906, 'Capybara', 'Wile E.', 'CA', '94132', '2012-01-05' );
insert into a_bkorders.customers values (259907, 'Hedge', 'Mr.', 'CA', '94132', '2011-09-05' );
insert into a_bkorders.customers values (282716, 'Biederbecke','Dwight', 'PA', '18106', '2013-01-01' );
insert into a_bkorders.customers values (287261, 'Biederbecke','Bix', 'PA', '18106', '2012-01-01' );
insert into a_bkorders.customers values (226275, 'Dalrymple','Jack', 'SD', '57216', '2013-01-01' );
insert into a_bkorders.customers values (228175, 'Cardin','Benjamin', 'MD', '20609', '2013-04-02' );
insert into a_bkorders.customers values (228275, 'Mikulski','Barbara', 'MD', '21203', '2013-04-04' );
insert into a_bkorders.customers values (228352, 'Edwards','Donna', 'MD', '21205', '2013-06-08' );
-- orders and order_details
/* July 2011 */
Insert into a_bkorders.order_headers values(21841, '2011-07-02', 267780);
Insert into a_bkorders.order_details values(21841, 1, 1448, 50, 25.00);
Insert into a_bkorders.order_headers values(21850, '2011-07-02', 261502);
Insert into a_bkorders.order_details values(21850, 1, 1162, 1, 30.49);
Insert into a_bkorders.order_details values(21850, 2, 1109, 1, 25.00);
Insert into a_bkorders.order_headers values(2045, '2011-07-18', 267780);
Insert into a_bkorders.order_details values(2045, 1, 1894, 1, 35.99);
Insert into a_bkorders.order_headers values(2200, '2011-07-18', 261502);
Insert into a_bkorders.order_details values(2200, 1, 1200, 5, 16.33);
Insert into a_bkorders.order_details values(2200, 2, 1180, 5, 45.99);
Insert into a_bkorders.order_details values(2200, 3, 1128, 5, 46.20);
/* Sep 2011 */
Insert into a_bkorders.order_headers values(22909, '2011-09-25', 239427);
Insert into a_bkorders.order_details values(22909, 1, 1104, 5, 45.00);
Insert into a_bkorders.order_headers values(22910, '2011-09-25', 218709);
Insert into a_bkorders.order_details values(22910, 1, 1678, 5, 49.99);
Insert into a_bkorders.order_details values(22910, 2, 1162, 5, 35.00);
Insert into a_bkorders.order_headers values(32997, '2011-09-22', 239427);
Insert into a_bkorders.order_details values(32997, 1, 1948, 5, 40.94);
Insert into a_bkorders.order_details values(32997, 2, 1199, 5, 18.39);
Insert into a_bkorders.order_details values(32997, 3, 1457, 5, 53.99);
Insert into a_bkorders.order_details values(32997, 4, 1133, 5, 18.15);
Insert into a_bkorders.order_details values(32997, 5, 1894, 5, 36.79);
Insert into a_bkorders.order_headers values(32998, '2011-09-22', 261502);
Insert into a_bkorders.order_details values(32998, 1, 2006, 3, 20.00);
Insert into a_bkorders.order_headers values(41005, '2011-09-28', 290298);
Insert into a_bkorders.order_details values(41005, 1, 1142, 2, 42.45);
Insert into a_bkorders.order_details values(41005, 2, 1107, 4, 21.50);
Insert into a_bkorders.order_headers values(41006, '2011-09-28', 267780);
Insert into a_bkorders.order_details values(41006, 1, 1142, 10, 42.95);
Insert into a_bkorders.order_headers values(42899, '2011-09-29', 261502);
Insert into a_bkorders.order_details values(42899, 1, 1128, 5, 25.00);
Insert into a_bkorders.order_details values(42899, 2, 1103, 1 , 10.95);
/* Oct 2011 */
Insert into a_bkorders.order_headers values(21254, '2011-10-23', 263119);
Insert into a_bkorders.order_details values(21254, 2, 2008, 10, 46.95);
Insert into a_bkorders.order_details values(21254, 3, 2007, 10, 39.00);
Insert into a_bkorders.order_headers values(21255, '2011-10-28', 267780);
Insert into a_bkorders.order_details values(21255, 1, 1101, 5, 59.99);
Insert into a_bkorders.order_details values(21255, 2, 1142, 5, 39.00);
Insert into a_bkorders.order_details values(21255, 3, 1162, 2, 35.00);
Insert into a_bkorders.order_headers values(21261, '2011-10-28', 200368);
Insert into a_bkorders.order_details values(21261, 1, 1142, 100, 34.95);
Insert into a_bkorders.order_details values(21261, 2, 1128, 50, 46.95);
Insert into a_bkorders.order_details values(21261, 3, 2001, 100, 39.00);
Insert into a_bkorders.order_headers values(32905, '2011-10-02', 259906);
Insert into a_bkorders.order_details values(32905, 1, 2028, 1, 58.00);

Answer 1

Try this:
SELECT c.cust_id, SUM(IF(QUARTER(od.orders) = 1, od.order_price * od.quantity, 0)) Quarter1,
SUM(IF(QUARTER(od.orders) = 2, od.order_price * od.quantity, 0)) Quarter2,
SUM(IF(QUARTER(od.orders) = 3, od.order_price * od.quantity, 0)) Quarter3,
SUM(IF(QUARTER(od.orders) = 4, od.order_price * od.quantity, 0)) Quarter4
FROM a_bkorders.customers c
INNER JOIN a_bkorders.order_headers oh ON c.cust_id = oh.cust_id
INNER JOIN a_bkorders.order_details od ON oh.order_id = od.order_id
WHERE YEAR(od.orders) = YEAR(CURRENT_DATE()) - 1
GROUP BY c.cust_id