[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 0A2 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 0A2 2 C1 0 0 0 0 0 0 30 0A2 3 C4 40 0 0 110 70 0 0 0A3 2 C1 0 0 0 0 0 0 0 20--------------- 删除实体DROP VIEW RESULT;DROP PROCEDURE P_TEST;DROP TABLE TEST; 0 0 0