更改具有混合字段类型的列中的日期格式

Question

我正在准备一份报告，其中包含混合字段类型（字符串、日期等）的列

日期格式让我烦恼！你能帮我弄清楚如何改变它吗？我希望它看起来像“dd.MM.yyyy HH:MM”。

WITH t1 AS (
SELECT obj_name ,
          attr_name ,
          LAG(new_val_name) OVER (PARTITION BY attr_name ORDER BY stamp) l_st ,
          new_val_name ,
          employee_name,
          stamp
FROM SYS_AU_CHANGE_TYPE_ATTR change
WHERE OBJ_ID = :IDEC)

SELECT obj_name,
          attr_name,
          l_st,
          new_val_name,
          employee_name,
          stamp
          FROM t1 
          ORDER BY stamp DESC

Answer 1

尝试将行从 -stamp 更改为 -TO_CHAR(stamp, 'DD.MM.YYYY HH24:MI') AS formatted_stamp

        WITH t1 AS (
    SELECT obj_name,
           attr_name,
           LAG(new_val_name) OVER (PARTITION BY attr_name ORDER BY stamp) l_st,
           new_val_name,
           employee_name,
           TO_CHAR(stamp, 'DD.MM.YYYY HH24:MI') AS formatted_stamp
    FROM SYS_AU_CHANGE_TYPE_ATTR change
    WHERE OBJ_ID = :IDEC
)
SELECT obj_name,
       attr_name,
       l_st,
       new_val_name,
       employee_name,
       formatted_stamp
FROM t1
ORDER BY formatted_stamp DESC;

• DD → 天（两位数）
• MM → 月份（两位数）
• YYYY → 年份（四位数）
• HH24 → 24 小时格式的小时
• MI → 分钟（两位数）