PL SQL 过程的打印标题

Question

我有以下 SQL 过程代码：

create or replace procedure numOfSupplier(X IN NUMBER)IS
OUTPUT VARCHAR(500);

BEGIN 

    FOR supplerTable IN (SELECT R_NAME, N_NAME
    FROM SUPPLIER join NATION on S_NATIONKEY = N_NATIONKEY
    join REGION on N_REGIONKEY = R_REGIONKEY
    GROUP BY R_NAME, N_NAME
    HAVING COUNT (S_NATIONKEY) > X)

LOOP

DBMS_OUTPUT.PUT_LINE (supplerTable.R_NAME || supplerTable.N_NAME);

END LOOP;

END numOfSupplier;
/

运行时，给我：https://i.imgur.com/zEEKpya.png

我正在尝试这个节目：https://i.imgur.com/7fvAc6O.png

知道如何打印标题吗？

DBMS_OUTPUT.PUT_LINE 似乎有限

提前致谢！

PS，我尝试在循环之前使用 DBMS_OUTPUT.PUT_LINE 但它出错了：

12/1 PLS-00103：预期时遇到符号“DBMS_OUTPUT” 以下之一： 环形 符号“循环”被替换为“DBMS_OUTPUT”以继续。

20/5 PLS-00103：预期时遇到符号“NUMOFSUPPLIER” 以下之一： 循环

尝试时出错：

OUTPUT VARCHAR(500);

BEGIN 

    FOR supplerTable IN (SELECT R_NAME, N_NAME
    FROM SUPPLIER join NATION on S_NATIONKEY = N_NATIONKEY
    join REGION on N_REGIONKEY = R_REGIONKEY
    GROUP BY R_NAME, N_NAME
    HAVING COUNT (S_NATIONKEY) > X)

DBMS_OUTPUT.PUT_LINE ('HELLO');

LOOP

DBMS_OUTPUT.PUT_LINE (supplerTable.R_NAME || supplerTable.N_NAME);

END LOOP;

END numOfSupplier;
/

Answer 1

您不能将DBMS_OUTPUT.PUT_LINE 放在循环标题的中间。你必须把它完全放在循环之前。

...
DBMS_OUTPUT.PUT_LINE ('<The header goes here>');

FOR supplerTable IN (...) LOOP
  DBMS_OUTPUT.PUT_LINE (supplerTable.R_NAME || supplerTable.N_NAME);
END LOOP;
...