有book及book_copy两个表，要根据book_copy表中的某几个字段删除book表中所有与其相等的记录。

存储过程如下：

CREATE OR REPLACE PROCEDURE PROC_DEL_RECORDS IS
     v_cur_records INTEGER := 0;
BEGIN
     LOOP
         --若表中已无数据，则退出循环
         SELECT COUNT(*) INTO v_cur_records FROM book_copy WHERE ROWNUM = 1;
         IF v_cur_records = 0 THEN
              EXIT;
         END IF;
    
         DELETE FROM book WHERE (ID, NAME) IN (SELECT ID, NAME FROM book_copy WHERE ROWNUM < 1000);
         DELETE FROM book_copy WHERE ROWNUM < 1000;
    
         COMMIT;
      END LOOP;
EXCEPTION
      WHEN OTHERS THEN
          DBMS_OUTPUT.put_line('EXCEPTION OCCURED');
END PROC_DEL_RECORDS;

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