Oracle SQL2-用分析函数改写子查询

create table ITEM
(
CODE     VARCHAR2(10),
PRICE    NUMBER,
YEAR     VARCHAR2(10),
PRODATE  DATE,
SALPRICE NUMBER,
BUYPRICE NUMBER
);
commit;
insert into ITEM (CODE, PRICE, YEAR, PRODATE, SALPRICE, BUYPRICE)
values ('001', 100, '2017', to_date('11-07-2017', 'dd-mm-yyyy'), 200, 50);
insert into ITEM (CODE, PRICE, YEAR, PRODATE, SALPRICE, BUYPRICE)
values ('001', 200, '2017', to_date('17-07-2017', 'dd-mm-yyyy'), 300, 150);
insert into ITEM (CODE, PRICE, YEAR, PRODATE, SALPRICE, BUYPRICE)
values ('001', 300, '2017', to_date('18-07-2017', 'dd-mm-yyyy'), 400, 250);
insert into ITEM (CODE, PRICE, YEAR, PRODATE, SALPRICE, BUYPRICE)
values ('002', 100, '2016', to_date('08-07-2016', 'dd-mm-yyyy'), 200, 50);
insert into ITEM (CODE, PRICE, YEAR, PRODATE, SALPRICE, BUYPRICE)
values ('002', 300, '2016', to_date('07-07-2016', 'dd-mm-yyyy'), 400, 250);
insert into ITEM (CODE, PRICE, YEAR, PRODATE, SALPRICE, BUYPRICE)
values ('002', 200, '2017', to_date('06-07-2017', 'dd-mm-yyyy'), 300, 150);
insert into ITEM (CODE, PRICE, YEAR, PRODATE, SALPRICE, BUYPRICE)
values ('002', 400, '2017', to_date('19-07-2017', 'dd-mm-yyyy'), 500, 350);
insert into ITEM (CODE, PRICE, YEAR, PRODATE, SALPRICE, BUYPRICE)
values ('003', 100, '2015', to_date('08-07-2015', 'dd-mm-yyyy'), 200, 50);
insert into ITEM (CODE, PRICE, YEAR, PRODATE, SALPRICE, BUYPRICE)
values ('003', 200, '2014', to_date('17-07-2014', 'dd-mm-yyyy'), 300, 150);
insert into ITEM (CODE, PRICE, YEAR, PRODATE, SALPRICE, BUYPRICE)
values ('004', 100, '2017', to_date('11-07-2017', 'dd-mm-yyyy'), 200, 50);
insert into ITEM (CODE, PRICE, YEAR, PRODATE, SALPRICE, BUYPRICE)
values ('005', 200, '2017', to_date('16-07-2017', 'dd-mm-yyyy'), 300, 150);
commit;

create table ITEMSTS
(
CODE     VARCHAR2(10),
ITEMTYPE NUMBER,
ITEMSTS  NUMBER
);
commit;
insert into ITEMSTS (CODE, ITEMTYPE, ITEMSTS)
values ('001', 1, 1);
insert into ITEMSTS (CODE, ITEMTYPE, ITEMSTS)
values ('002', 1, 1);
insert into ITEMSTS (CODE, ITEMTYPE, ITEMSTS)
values ('003', 1, 1);
insert into ITEMSTS (CODE, ITEMTYPE, ITEMSTS)
values ('004', 3, 1);
insert into ITEMSTS (CODE, ITEMTYPE, ITEMSTS)
values ('005', 2, 2);
insert into ITEMSTS (CODE, ITEMTYPE, ITEMSTS)
values ('005', 1, 2);
commit;

SELECT I.CODE,
I.YEAR,
I.PRODATE,
(SELECT SUM(I2.PRICE)
FROM ITEM I2
WHERE I.CODE = I2.CODE
AND I2.PRODATE BETWEEN I.PRODATE - 180 AND I.PRODATE
AND I.YEAR = I2.YEAR) AS SUM_PRICE,
(SELECT SUM(I2.SALPRICE)
FROM ITEM I2
WHERE I.CODE = I2.CODE
AND I2.PRODATE BETWEEN I.PRODATE - 180 AND I.PRODATE
AND I.YEAR = I2.YEAR) AS SUM_SALPRICE,
(SELECT SUM(I2.BUYPRICE)
FROM ITEM I2
WHERE I.CODE = I2.CODE
AND I2.PRODATE BETWEEN I.PRODATE - 180 AND I.PRODATE
AND I.YEAR = I2.YEAR) AS SUM_BUYPRICE
FROM ITEM I, ITEMSTS S
WHERE I.CODE = S.CODE
AND S.ITEMTYPE = 1
AND S.ITEMSTS = 1
AND I.PRODATE > SYSDATE - 30

SELECT I.CODE,
I.YEAR,
I.PRODATE,
CASE
WHEN I.PRODATE > SYSDATE - 30 THEN
SUM(I.PRICE) OVER(PARTITION BY I.CODE,
I.YEAR ORDER BY I.PRODATE RANGE BETWEEN 180
PRECEDING AND CURRENT ROW)
END AS SUM_PRICE,
CASE
WHEN I.PRODATE > SYSDATE - 30 THEN
SUM(I.SALPRICE) OVER(PARTITION BY I.CODE,
I.YEAR ORDER BY I.PRODATE RANGE BETWEEN 180
PRECEDING AND CURRENT ROW)
END AS SAL_SUM_PRICE,
CASE
WHEN I.PRODATE > SYSDATE - 30 THEN
SUM(I.BUYPRICE) OVER(PARTITION BY I.CODE,
I.YEAR ORDER BY I.PRODATE RANGE BETWEEN 180
PRECEDING AND CURRENT ROW)
END AS BUY_SUM_PRICE

FROM ITEM I
INNER JOIN ITEMSTS S ON I.CODE = S.CODE
WHERE S.ITEMTYPE = 1
AND S.ITEMSTS = 1
AND I.PRODATE > SYSDATE - 30