Sql 如何从listagg中删除重复项

这是我的代码：

SELECT rule,
       DATASET,
       type,
       LISTAGG(source,';') within GROUP (ORDER BY source) AS source,
       TARGET, 
       LISTAGG(filter,';') within GROUP (ORDER BY filter)  AS filter
FROM demo_table;

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我的问题是我使用的两个

listag（）

。在两个源和一个过滤器的情况下，它给出了重复的过滤器，反之亦然。我可以添加哪些内容来获得源和筛选器的确切数量？

使用Distinct INDER LISTAGG（）

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在LISTAGG（）内部使用Distinct

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首先选择所需的不同值，然后对其应用LISTAGG。下面是一个基于Scott模式的示例

SQL> -- Duplicate jobs within the department
SQL> select deptno, listagg(job, ', ') within group (order by job) jobs
  2  from emp
  3  group by deptno;

    DEPTNO JOBS
---------- ------------------------------------------------------------
        10 CLERK, MANAGER, PRESIDENT
        20 ANALYST, ANALYST, CLERK, CLERK, MANAGER
        30 CLERK, MANAGER, SALESMAN, SALESMAN, SALESMAN, SALESMAN

SQL>
SQL> -- This won't work - DISTINCT can't be used in LISTAGG
SQL> select deptno, listagg(distinct job, ', ') within group (order by job) jobs
  2  from emp
  3  group by deptno;
select deptno, listagg(distinct job, ', ') within group (order by job) jobs
               *
ERROR at line 1:
ORA-30482: DISTINCT option not allowed for this function


SQL>
SQL> -- So - select distinct jobs first, then apply LISTAGG to it
SQL> select x.deptno, listagg(x.job, ', ') within group (order by x.job) jobs
  2  from (select distinct deptno, job
  3        from emp) x
  4  group by x.deptno;

    DEPTNO JOBS
---------- ------------------------------------------------------------
        10 CLERK, MANAGER, PRESIDENT
        20 ANALYST, CLERK, MANAGER
        30 CLERK, MANAGER, SALESMAN

SQL>

---

首先选择所需的不同值，然后对其应用LISTAGG。下面是一个基于Scott模式的示例

SQL> -- Duplicate jobs within the department
SQL> select deptno, listagg(job, ', ') within group (order by job) jobs
  2  from emp
  3  group by deptno;

    DEPTNO JOBS
---------- ------------------------------------------------------------
        10 CLERK, MANAGER, PRESIDENT
        20 ANALYST, ANALYST, CLERK, CLERK, MANAGER
        30 CLERK, MANAGER, SALESMAN, SALESMAN, SALESMAN, SALESMAN

SQL>
SQL> -- This won't work - DISTINCT can't be used in LISTAGG
SQL> select deptno, listagg(distinct job, ', ') within group (order by job) jobs
  2  from emp
  3  group by deptno;
select deptno, listagg(distinct job, ', ') within group (order by job) jobs
               *
ERROR at line 1:
ORA-30482: DISTINCT option not allowed for this function


SQL>
SQL> -- So - select distinct jobs first, then apply LISTAGG to it
SQL> select x.deptno, listagg(x.job, ', ') within group (order by x.job) jobs
  2  from (select distinct deptno, job
  3        from emp) x
  4  group by x.deptno;

    DEPTNO JOBS
---------- ------------------------------------------------------------
        10 CLERK, MANAGER, PRESIDENT
        20 ANALYST, CLERK, MANAGER
        30 CLERK, MANAGER, SALESMAN

SQL>

---

我试过了，但它说ORA-30482：这个函数30482不允许使用不同的选项。00000-“此函数不允许使用不同选项”，因为它仅适用于Oracle 19c。有关

listagg

的版本比较，请参见以下答案：我尝试过，但它显示ORA-30482：此函数30482不允许使用不同的选项。00000-“此函数不允许使用不同选项”，因为它仅适用于Oracle 19c。有关

listag

的版本比较，请参见以下答案：您能提供示例数据吗？i、 你能提供样本数据吗？i、 e SqlFiddleof