Pls-00364: 循环索引变量 'j' 使用无效

Question

我正在尝试计算架构中每个表的数量。

SET serveroutput ON;
BEGIN
FOR I IN (SELECT TABLE_NAME FROM USER_TABLES) LOOP
FOR J IN (SELECT COUNT(1) CNT FROM I.TABLE_NAME) LOOP
DBMS_OUTPUT.PUT_LINE(I.TABLE_NAME||'>>'||J.CNT);
END LOOP;
END LOOP;
END;
/

但是我遇到了这样的错误。，

Error report:
ORA-06550: line 3, COLUMN 37:
PL/SQL: ORA-00942: TABLE OR VIEW does NOT exist
ORA-06550: line 3, COLUMN 10:
PL/SQL: SQL Statement ignored
ORA-06550: line 4, COLUMN 42:
PLS-00364: loop INDEX variable 'J' USE IS invalid
ORA-06550: line 4, COLUMN 1:
PL/SQL: Statement ignored

可以在sql查询本身中实现吗？ /

Answer 1

你需要使用动态sql来实现：

DECLARE 
  val NUMBER;
BEGIN
FOR I IN (SELECT TABLE_NAME FROM USER_TABLES) LOOP
  EXECUTE IMMEDIATE 'SELECT count(*) FROM ' || i.table_name INTO val;
  DBMS_OUTPUT.PUT_LINE(i.table_name || ' ==> ' || val );
END LOOP;
END;
/