我想从列中存在的模式中的每个表中获取名为“YMDH”的列中的不同日期。我想我需要使用嵌套游标(我以前没有做过的)，并提出了以下代码：
CREATE OR REPLACE PROCEDURE DistinctDates AS
sql_statement1 varchar2(200);
sql_statement2 varchar2(200);
results varchar2(15);
ColumnExist integer;
BEGIN
for cursor_rec in (SELECT * FROM user_objects WHERE object_type='TABLE'
AND object_name NOT LIKE 'TM%') loop
sql_statement1 := 'select count (*) from user_tab_columns where table_name=' || '''' || cursor_rec.object_name || '''' || ' and column_name=' || '''' ||'YMDH' || '''';
execute immediate sql_statement1 into ColumnExist;
if ColumnExist = 1 then
for inner_cursor_rec in (select distinct(ymdh) from cursor_rec.object_name) loop
null;
end loop;
end if;
end loop;
END DistinctDates;SQL Developer正在抱怨内部游标的select语句。错误消息是：
Error(18,32): PL/SQL: SQL Statement ignored
Error(18,70): PL/SQL: ORA-00942: table or view does not exist
所以它不会识别对外部游标的引用。我如何将表名(这是cursor_rec.object_name)传递给内部游标？