oracle 行转列和列转行

 WITH L AS
  (SELECT LEVEL AS LV FROM DUAL CONNECT BY LEVEL <= 9  ),
  m AS (
 SELECT A.LV AS LV_A,
        B.LV AS LV_B,
        TO_CHAR(B.LV) || 'x' || TO_CHAR(A.LV) || '=' ||
        RPAD(TO_CHAR(A.LV * B.LV), 2, ' ') AS TEXT
   FROM L A, L B
  WHERE b.LV <= a.LV  )
  SELECT listagg( m.text,' ') WITHIN GROUP (ORDER BY m.lv_b ) AS 九九表
  FROM m
  GROUP BY m.lv_a
  ;

列转行 练习题；

 SELECT 部门,nvl(职员,0.00),nvl(推销员,0.00),nvl(董事长,0.00),nvl(总经理,0.00),nvl(分析员,0.00)
 FROM (
 SELECT
      to_char(a.deptno) AS 部门,
       MIN(DECODE(a.job,'CLERK',a.avg_sal)) 职员,
       MIN(DECODE(a.job,'SALESMAN',a.avg_sal)) 推销员,
       MIN(dECODE(a.job,'PRESIDENT',a.avg_sal)) 董事长,
       MIN(DECODE(a.job,'MANAGER',a.avg_sal)) 总经理,
       MIN(DECODE(a.job,'ANALYST',a.avg_sal)) 分析员
 FROM (
 SELECT
       e.deptno ,
       e.job,
       ROUND (AVG(sal),5) avg_sal
 FROM emp e
 GROUP BY e.job,e.deptno
 ORDER BY e.deptno
 ) a
 GROUP BY a.deptno
 ORDER BY a.deptno
 )
 UNION ALL
 SELECT 部门,nvl(职员,0.00),nvl(推销员,0.00),nvl(董事长,0.00),nvl(总经理,0.00),nvl(分析员,0.00)
  FROM(
 SELECT
         '职位总和' AS 部门,
         max(sum(DECODE(job,'CLERK',sal))) AS 职员,
         max(sum(DECODE(job,'SALESMAN',sal))) AS 推销员,
         max(sum(DECODE(job,'PRESIDENT',sal))) AS 董事长,
         max(sum(DECODE(job,'MANAGER',sal))) AS 总经理,
        max( sum(DECODE(job,'ANALYST',sal))) AS 分析员
 FROM emp
 GROUP BY job

 )
 UNION ALL
 SELECT 部门,nvl(职员,0.00),nvl(推销员,0.00),nvl(董事长,0.00),nvl(总经理,0.00),nvl(分析员,0.00)
  FROM(
 SELECT
         '平均值' AS 部门,
         min(DECODE(job,'CLERK',ROUND (AVG(sal),5))) AS 职员,
         min(DECODE(job,'SALESMAN',ROUND (AVG(sal),5))) AS 推销员,
         min(DECODE(job,'PRESIDENT',ROUND (AVG(sal),5))) AS 董事长,
         min(DECODE(job,'MANAGER',ROUND (AVG(sal),5))) AS 总经理,
         min(DECODE(job,'ANALYST',ROUND (AVG(sal),5))) AS 分析员
 FROM emp
 GROUP BY job

 );

上例题的简化版 ：

 /*
 1.先用使用decode()进行行转列查出基础数据作为A表！ ; ;
 2.B表对A表中的数据进行汇总然后进行合并;
 */
 WITH a AS (
 SELECT
       to_char(deptno)                    AS deptno  ,
       SUM(DECODE(job,'ANALYST',sal,0))   AS ANALYST,
       SUM(DECODE(job,'CLERK',sal,0))     AS  CLERK,
       SUM(DECODE(job,'MANAGER',sal,0))   AS MANAGER,
       SUM(DECODE(job,'PRESIDENT',sal,0)) AS  PRESIDENT,
       SUM(DECODE(job,'SALESMAN',sal,0))  AS SALESMAN ,
       SUM(sal) AS  总和
 FROM  scott.EMP
 GROUP BY deptno
 ORDER BY 1 ),
 b AS (
 SELECT '总和',
        sum(ANALYST),
        sum(CLERK),
        sum(MANAGER),
        sum(PRESIDENT),
        sum(SALESMAN) ,
        SUM(总和) FROM a )
 SELECT * FROM a
 UNION ALL
 SELECT * FROM b ;