Question

DECLARE
  trn  VARCHAR2(2) := 'DD';
  cur  SYS_REFCURSOR;
BEGIN
  OPEN cur FOR
    SELECT
      TRUNC(some_date, trn),
      NULL AS dummy_2,
      COUNT( DISTINCT dummy_1 )
    FROM
      (SELECT SYSDATE AS some_date, ROWNUM AS dummy_1 FROM dual)
    GROUP BY
      TRUNC(some_date, trn);
END;

这适用于Oracle 10，但Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production导致：

ORA-00979：不是GROUP BY表达式
ORA-06512：第5行

有人可以复制/解释这个吗？谢谢！

Answer 1

如果您有权访问支持，则看起来像Bug 9478304: LOOP FAILING WITH ORA-00979: NOT A GROUP BY EXPRESSION。这似乎仅影响11.2.0.1。

Answer 2

我怀疑您的问题是NULL中的SELECT需要在GROUP BY中，即使它是常数。我无法想象为什么它在Oracle 10中会起作用，但不会在11中起作用。

如果您删除NULL AS dummy_2？

是否有用

Answer 3

这没有错误：

DECLARE
  trn  VARCHAR2(2) := 'DD';
  cur  SYS_REFCURSOR;
BEGIN
  OPEN cur FOR
    SELECT
      TRUNC(some_date, dtrn),
      NULL AS dummy_2,
      COUNT( DISTINCT dummy_1 )
    FROM
      (SELECT SYSDATE AS some_date, ROWNUM AS dummy_1 FROM dual) data1,
      (SELECT trn AS dtrn FROM dual) data2
    GROUP BY TRUNC(some_date, dtrn);
END;

问题在于使用trn函数中的TRUNC变量和变量。也许是bug。

Answer 4

截断内部选择中的sysdate似乎工作正常：

DECLARE
  trn  VARCHAR2(2) := 'DD';
  cur  SYS_REFCURSOR;
BEGIN
  OPEN cur FOR
    SELECT
      some_date,
      NULL AS dummy_2,
      COUNT( DISTINCT dummy_1 )
    FROM
      (SELECT trunc(SYSDATE, trn) AS some_date, ROWNUM AS dummy_1 FROM dual)
    GROUP BY
      some_date;
END;

查询适用于Oracle 10g但不适用于11g？

4 个答案: