Oracle 执行存储过程中FOR循环内变量中存储的查询时出错

在运行此准备好的语句时

DECLARE

BEGIN
-- Get the list of dependent tables and store it in a variable.
FOR cons IN (SELECT A.TABLE_NAME 
    FROM ALL_CONSTRAINTS A, ALL_CONSTRAINTS B
    WHERE A.CONSTRAINT_TYPE = 'xxx'
    AND A.R_CONSTRAINT_NAME = B.CONSTRAINT_NAME
    AND A.R_OWNER  = B.OWNER
    AND B.TABLE_NAME = 'MY_TABLE'
    AND B.OWNER = 'DBA')

LOOP
    SET @querytext = CONCAT('SELECT * FROM ',cons.TABLE_NAME);

        PREPARE stamquery FROM @querytext;

        EXECUTE stamquery;

        DEALLOCATE PREPARE stamquery;

END LOOP;
END;

我得到的错误说明：

Encountered the symbol "STAMQUERY" when expecting one of the following:

   := . ( @ % ;

我是个新手，但根据我在互联网上的研究，这似乎是一种方法

---

请告诉我我做错了什么。

您用于PL/SQL的语法不正确。应该是这样的

DECLARE
  querytext   VARCHAR2(1000); --declare the variable to store query.
  v_tab_count NUMBER;
BEGIN
  -- Get the list of dependent tables and store it in a variable.
  FOR cons IN
  (
    SELECT
      A.TABLE_NAME
    FROM
      ALL_CONSTRAINTS A,
      ALL_CONSTRAINTS B
    WHERE
      A.CONSTRAINT_TYPE     = 'xxx'
    AND A.R_CONSTRAINT_NAME = B.CONSTRAINT_NAME
    AND A.R_OWNER           = B.OWNER
    AND B.TABLE_NAME        = 'MY_TABLE'
    AND B.OWNER             = 'DBA'
  )
  LOOP
    querytext := CONCAT('SELECT COUNT(*) FROM ',cons.TABLE_NAME);
    EXECUTE IMMEDIATE querytext INTO v_tab_count ; --dynamicall execute the
    -- select statement.
    DBMS_OUTPUT.PUT_LINE( 'TABLE ' ||cons.TABLE_NAME||' COUNT '||v_tab_count);
    -- Display the table name and its count of rows.
  END LOOP;
END;

---

设置@querytext=。。。是无效的PL/SQL。你在哪里找到的？你到底想做什么？太棒了谢谢：