Oracle 中的嵌套循环无法正常工作（超过最大值）

Question

我为示例 Table 编写了这两个查询以从“z_exp14_main”插入“z_exp14_resualt”。 第一个查询工作正常（空）但第二个查询在主table（非空）上有due_date，工作不正常！ .我认为问题在于循环。
它在截止日期之前开始，甚至超过了截止日期。对于 NOT Nulls，插入必须从今天开始（年和月从 sysdate 开始，日期从 opening_date 开始）并继续直到 due_date

计算 Null DUE_DATES

declare
  i number := 1;
BEGIN
for i in 1..12 loop
  insert into z_exp14_resualt 
  select dep_id,ADD_MONTHS(ADD_MONTHS(opening_date,trunc( months_between (sysdate,opening_date))),i),rate*balance 
  from z_exp14_main
  WHERE due_date IS  null;
end loop;
END;
/

并且对于 Not Null Due_dates

  DECLARE
    diff number;
    x number :=1;
    BEGIN    
    for i in (select * FROM z_exp14_main WHERE due_date IS NOT null) loop    
        diff :=trunc( months_between (sysdate,i.opening_date));
        
            WHILE (ADD_MONTHS(ADD_MONTHS(i.opening_date,diff),x)<i.due_date) LOOP
                insert into z_exp14_resualt 
                select dep_id,ADD_MONTHS(ADD_MONTHS(i.opening_date,diff),x),rate*balance 
                from z_exp14_main WHERE due_date is not null  ;
                x :=x+1;
            end loop;
      end loop;
    end;
    /

主样本日期 (z_exp14_main)

--	DEP_ID	DUE_DATE	BALANCE	RATE	OPENING_DATE
--	20056634	null	283428	10	15-SEP-16
--	20056637	null	180222	10	07-NOV-14
--	20056639	null	58741	10	28-AUG-14
--	40000020	27-NOV-21	5000000	22	31-MAR-14
--	40000023	23-APR-21	63000000	22	25-AUG-18

Answer 1

问题出在“While”条件下。我更正了，这是最终答案：

DECLARE
    diff number;
    x number ;
    BEGIN    
    for i in (select * FROM z_exp14_main WHERE due_date IS NOT null) loop    
        diff :=trunc( months_between (sysdate,i.opening_date));
        x:=0;
            WHILE (add_months(sysdate,x)<i.due_date) LOOP
                insert into z_exp14_resualt values (i.dep_id,ADD_MONTHS(ADD_MONTHS(i.opening_date,diff),x),(i.rate*i.balance) );
                x :=x+1;
            end loop;
      end loop;
    end;
    /

Oracle 中的嵌套循环无法正常工作（超过最大值）

Nested Loops In Oracle Not Work Correctly (Exceeds the maximum)

sql

database

oracle

plsql

stored-procedures