oracle 总是出现ora-00937和ora-06512 at line 12

Question

DECLARE

a number := 0000000129;
b number := 0000000137;
count number := 0;
BEGIN

WHILE a<=b LOOP
DECLARE

c number := 0000000121;

d number := 0000000138;

BEGIN

WHILE c<d LOOP

insert into od
select 站点起,站点终,count(cid) from wu1 where 起站编号=a and 终站编号=c;
c := c+1;

END LOOP;
END;
a := a+1;
END LOOP;
END;

Answer 1

DECLARE  
a number := 0000000129;
b number := 0000000137;
count number := 0;
BEGIN 
 WHILE a<=b LOOP
DECLARE  
c number := 0000000121; 
d number :=......
答案就在这里：oracle 循环嵌套 插入表中 总是出现ora-00937和ora-06512 at line 12
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