如何将查询的输出迭代到另一个选择查询作为输入参数？

Question

我想将以下查询的输出作为输入参数传递给另一个查询。

 SELECT DISTINCT MV_sum.exch
          FROM LLDMA.MERCAUDIT_VOLUME_AGG_SUMMARY MV_sum,
               EXCHANGE_MAPPING ex_map
         WHERE MV_SUM.EXCH = ex_map.agora_exchange
ORDER BY 1;

查询 1 的示例输出：

ABC
CDE
DEF
GHI
XYX

我想将此输出一一作为输入参数传递给以下查询 将输出迭代到另一个查询

我已经编写了以下代码，因为我是 oracle 的新手，但是它抛出了一些错误 请帮我解决这个问题.....

DECLARE
   exch_name       VARCHAR2 (200);
   v_exch          VARCHAR2 (1000);
   v_exch_output   VARCHAR2 (4000);
   v_cnt_tot       VARCHAR2 (4000);
   abc             VARCHAR2 (4000);
   v_str           VARCHAR2 (4000);

   CURSOR tbl
   IS
        SELECT DISTINCT MV_sum.exch
          FROM LLDMA.MERCAUDIT_VOLUME_AGG_SUMMARY MV_sum,
               EXCHANGE_MAPPING ex_map
         WHERE MV_SUM.EXCH = ex_map.agora_exchange
      ORDER BY 1;
BEGIN
   v_cnt_tot := 0;

   OPEN tbl;

   LOOP
      FETCH tbl INTO exch_name;

      EXIT WHEN tbl%NOTFOUND;
      v_str :=
         ' select distinct ''ICTO-10510'' ,   MV_sum.exch , to_char(to_date(MV_sum.TRADEDATE,''yymmdd''), ''dd-Mon-yyyy'')   ,  ''   ,  ''TDV''   ,  MV_sum.new  ,   ''NEW'' ,  '' , ''-- into abc  
from LLDMA.MERCAUDIT_VOLUME_AGG_SUMMARY MV_sum , EXCHANGE_MAPPING ex_map
where (TRADEDATE between TO_CHAR  (sysdate-545, ''YYMMDD'') and TO_CHAR  (sysdate, ''YYMMDD'') )
and MV_SUM.EXCH = ex_map.agora_exchange
and MV_sum.exch = exch_name
group by MV_sum.exch,
to_char(to_date(MV_sum.TRADEDATE, ''yymmdd''), ''dd-Mon-yyyy''),
MV_sum.new';

      EXECUTE IMMEDIATE v_str;

      DBMS_OUTPUT.PUT_LINE (v_str);
   END LOOP;



   CLOSE tbl;
END;
/

请告诉我该怎么做。

Answer 1

如果这是您需要实现的，代码不会将结果作为“选择语句”返回给您。 从您的代码中我注意到： - 您仅使用游标来遍历 EXCHANGE_MAPPING 表中的不同值 - 你可以取出这个语句 EXECUTE IMMEDIATE v_str - 如果你只使用 select 语句，你会得到同样的结果

    select distinct 'ICTO-10510' ,   MV_sum.exch ,    to_char(to_date(MV_sum.TRADEDATE,'yymmdd'), 'dd-Mon-yyyy'),
                '','TDV',  MV_sum.new ,  'NEW' ,  '', ''
from LLDMA.MERCAUDIT_VOLUME_AGG_SUMMARY MV_sum , EXCHANGE_MAPPING ex_map
where (TRADEDATE between TO_CHAR  (sysdate-545, 'YYMMDD') and TO_CHAR  (sysdate, 'YYMMDD') )
and MV_SUM.EXCH = ex_map.agora_exchange
group by MV_sum.exch,
to_char(to_date(MV_sum.TRADEDATE, 'yymmdd'), 'dd-Mon-yyyy'), MV_sum.new

Answer 2

您好，您可以尝试以下代码。

DECLARE
  exch_name     VARCHAR2(200);
  v_exch        VARCHAR2(1000);
  v_exch_output VARCHAR2(4000);
  v_cnt_tot     VARCHAR2(4000);
  abc           VARCHAR2(4000);
  v_str         VARCHAR2(4000);

  CURSOR tbl IS
    SELECT DISTINCT MV_sum.exch
      FROM LLDMA.MERCAUDIT_VOLUME_AGG_SUMMARY MV_sum, EXCHANGE_MAPPING ex_map
     WHERE MV_SUM.EXCH = ex_map.agora_exchange
     ORDER BY 1;
BEGIN
  v_cnt_tot := 0;
  for x in tbl loop
    -- no need of EXECUTE IMMEDIATE it will harm performance
    select distinct '' ICTO - 10510 '',
                    MV_sum.exch,
                    to_char(to_date(MV_sum.TRADEDATE, '' yymmdd ''), '' dd - Mon - yyyy ''),
                    '',
                    '' TDV '',
                    MV_sum.new,
                    '' NEW '',
                    '',
                    '' -- into abc  
      from LLDMA.MERCAUDIT_VOLUME_AGG_SUMMARY MV_sum, EXCHANGE_MAPPING ex_map
     where (TRADEDATE between TO_CHAR(sysdate - 545, '' YYMMDD '') and TO_CHAR(sysdate, '' YYMMDD ''))
       and MV_SUM.EXCH = ex_map.agora_exchange
       and MV_sum.exch = exch_name
    **--and  MV_sum.exch = x.exch**  exch value from upper query  
     group by MV_sum.exch, to_char(to_date(MV_sum.TRADEDATE, '' yymmdd ''), '' dd - Mon - yyyy ''), MV_sum.new;

  end loop;

exception
  when others then
    null;
END;

Answer 3

您好，您可以试试这个，如果您对所有行感兴趣，您需要通过 rownum =1 限制数量或行，那么您需要使用集合来保存所有值。不知道订单对您来说有什么重要意义，那么您需要在循环内修改查询

DECLARE
  exch_name VARCHAR2(200);
  v_exch    VARCHAR2(1000);
  output    VARCHAR2(4000);
  abc       VARCHAR2(4000); -- remove this.

  CURSOR tbl IS
    SELECT DISTINCT MV_sum.exch
      into exch_name
      FROM LLDMA.MERCAUDIT_VOLUME_AGG_SUMMARY MV_sum, EXCHANGE_MAPPING ex_map
     WHERE MV_SUM.EXCH = ex_map.agora_exchange
     ORDER BY 1;
BEGIN

  for x in tbl loop
    select 'ICTO-10510' || ',' || MV_sum.exch || ',' || to_char(to_date(MV_sum.TRADEDATE, 'yymmdd'), 'dd-Mon-yyyy') || ',' || '' || ',' || 'TDV' || ',' ||
           MV_sum.new || ',' || "NEW" || ',' || '' || ',' || ''
      into output
      from LLDMA.MERCAUDIT_VOLUME_AGG_SUMMARY MV_sum, EXCHANGE_MAPPING ex_map
     where (TRADEDATE between TO_CHAR(sysdate - 545, 'YYMMDD') and TO_CHAR(sysdate, 'YYMMDD'))
       and MV_SUM.EXCH = ex_map.agora_exchange
       and MV_sum.exch = x.exch --**changes**
       and rownum = 1
     group by MV_sum.exch, to_char(to_date(MV_sum.TRADEDATE, 'yymmdd'), 'dd-Mon-yyyy'), MV_sum.new;

    /* EXECUTE IMMEDIATE abc
    into output; */
    --dont need this .. .. 
    DBMS_OUTPUT.PUT_LINE(output);
  end loop;

exception
  when others then
    DBMS_OUTPUT.PUT_LINE('null');
    --null;`enter code here`
END;