[转]ORACLE 行转列问题

/*物料 需要数量 需要仓库 现存量仓库 现存量仓库数量 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 

我需要把上面的查询结果转换为下面的。

物料 需要数量 需要仓库 C1   C2   C3   C4   C5 

A1         2             C1        20   50    10     0     0 

A2         3             C4         40   0      0    110  70 

*/ 

---------------------------------------------------------------建表

----------------判断表是否存在

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

);

----------------第一部分测试数据

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;

---------------------------------------------------------------行转列的存储过程

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;

----------------------------------------------------------------结果

----------------执行存储过程，生成视图

BEGIN

  P_TEST;               

END;

----------------结果

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

----------------第二部分测试数据

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;

----------------报告存储过程，生成视图

BEGIN

  P_TEST;               

END;

----------------结果

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

--------------- 删除实体

DROP VIEW RESULT;

DROP PROCEDURE P_TEST;

DROP TABLE TEST;   


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