/*物料 需要數量 需要倉庫 現存量倉庫 現存量倉庫數量 批次
A1 2 C1 C1 20 123
A1 2 C1 C2 30 111
A1 2 C1 C2 20 222
A1 2 C1 C3 10 211
A2 3 C4 C1 40 321
A2 3 C4 C4 50 222
A2 3 C4 C4 60 333
A2 3 C4 C5 70 223
我需要把上面的查詢結果轉換爲下面的。
物料 需要數量 需要倉庫 C1 C2 C3 C4 C5
A1 2 C1 20 50 10 0 0
A2 3 C4 40 0 0 110 70
*/
---------------------------------------------------------------建表
----------------判斷表是否存在
declare num number;
begin
select count(1) into num from user_tables where table_name='TEST';
if num>0 then
execute immediate 'drop table TEST';
end if;
end;
----------------建表
CREATE TABLE TEST(
WL VARCHAR2(10),
XYSL INTEGER,
XYCK VARCHAR2(10),
XCLCK VARCHAR2(10),
XCLCKSL INTEGER,
PC INTEGER
);
----------------第一部分測試數據
INSERT INTO TEST VALUES('A1', 2, 'C1', 'C1' , 20, 123);
INSERT INTO TEST VALUES('A1', 2, 'C1', 'C2' , 30, 111);
INSERT INTO TEST VALUES('A1', 2, 'C1', 'C2' , 20, 222);
INSERT INTO TEST VALUES('A1', 2, 'C1', 'C3' , 10, 211);
INSERT INTO TEST VALUES('A2', 3, 'C4', 'C1' , 40, 321);
INSERT INTO TEST VALUES('A2', 3, 'C4', 'C4' , 50, 222);
INSERT INTO TEST VALUES('A2', 3, 'C4', 'C4' , 60, 333);
INSERT INTO TEST VALUES('A2', 3, 'C4', 'C5' , 70, 223);
COMMIT;
--select * from test;
---------------------------------------------------------------行轉列的存儲過程
CREATE OR REPLACE PROCEDURE P_TEST IS
V_SQL VARCHAR2(2000);
CURSOR CURSOR_1 IS SELECT DISTINCT T.XCLCK FROM TEST T ORDER BY XCLCK;
BEGIN
V_SQL := 'SELECT WL,XYSL,XYCK';
FOR V_XCLCK IN CURSOR_1
LOOP
V_SQL := V_SQL || ',' || 'SUM(DECODE(XCLCK,''' || V_XCLCK.XCLCK ||
''',XCLCKSL,0)) AS ' || V_XCLCK.XCLCK;
END LOOP;
V_SQL := V_SQL || ' FROM TEST GROUP BY WL,XYSL,XYCK ORDER BY WL,XYSL,XYCK';
--DBMS_OUTPUT.PUT_LINE(V_SQL);
V_SQL := 'CREATE OR REPLACE VIEW RESULT AS '|| V_SQL;
--DBMS_OUTPUT.PUT_LINE(V_SQL);
EXECUTE IMMEDIATE V_SQL;
END;
----------------------------------------------------------------結果
----------------執行存儲過程，生成視圖
BEGIN
P_TEST;
END;
----------------結果
SELECT * FROM RESULT T;
WL XYSL XYCK C1 C2 C3 C4 C5
---------- --------------------------------------- ---------- ---------- ---------- ---------- ---------- ----------
A1 2 C1 20 50 10 0 0
A2 3 C4 40 0 0 110 70
----------------第二部分測試數據
INSERT INTO TEST VALUES('A1', 2, 'C1', 'C6' , 20, 124);
INSERT INTO TEST VALUES('A2', 2, 'C1', 'C7' , 30, 121);
INSERT INTO TEST VALUES('A3', 2, 'C1', 'C8' , 20, 322);
COMMIT;
----------------報告存儲過程，生成視圖
BEGIN
P_TEST;
END;
----------------結果
SELECT * FROM RESULT T;
WL XYSL XYCK C1 C2 C3 C4 C5 C6 C7 C8
----- ----- -------- ------- -------- ---------- ---------- ---------- ---------- ---------- ----------
A1 2 C1 20 50 10 0 0 20 0 0
A2 2 C1 0 0 0 0 0 0 30 0
A2 3 C4 40 0 0 110 70 0 0 0
A3 2 C1 0 0 0 0 0 0 0 20
--------------- 刪除實體
DROP VIEW RESULT;
DROP PROCEDURE P_TEST;
DROP TABLE TEST;