Question

我有一个SQL查询，它带来了有关表空间及其大小的信息。我正在将此查询用于oracle数据库。

QUERY

SELECT
  df.tablespace_name                                                  tablespace,
  (df.total_space_mb - fs.free_space_mb)                              kullanilan_alan,
  fs.free_space_mb                                                    bos_alan,
  ROUND(100 * ((df.total_space - fs.free_space) / df.total_space), 2) doluluk_orani
  FROM (
       SELECT
         tablespace_name,
         SUM(bytes)                  total_space,
         ROUND(SUM(bytes) / 1048576) total_space_mb
       FROM dba_data_files
       GROUP BY tablespace_name) df,
  (
    SELECT
      tablespace_name,
      SUM(bytes)                  free_space,
      ROUND(SUM(bytes) / 1048576) free_space_mb
    FROM dba_free_space
    GROUP BY tablespace_name) fs
 WHERE df.tablespace_name = fs.tablespace_name (+)
 ORDER BY fs.tablespace_name;

这给我一个这样的结果：

system - 322 - 23 - 92.32

上面的查询显示了4列。我创建了一个有5列的新表，它有一个日期字段。所以我需要复制上面的查询结果，加上日期。这是一个例子：

system - 322 - 23 - 92.32 - 01/09/2014

我在sql方面不擅长，所以我尝试了太多但是失败了。

Answer 1

您总是可以在选择中使用“常量”值（因此在插入...中选择）

所以这完全有效：

insert into table2 (id, f1, f2, f3, f4, fdate, farbitrary)
select id, field1, field2, field3, field4, SYSDATE, 'I put what I want here')
from table1

在这种情况下，id，field1，field2，field3，field4是table1的字段，而SYSDATE是......当前日期和时间（'I put what I want here'是“常量”字符串）

Answer 2

您可以按SYSDATE获取今天的日期，并附加到选择列表以便插入新表格。

INSERT INTO newTable(colA,colB,colC,colD,DateColumn)

SELECT df.tablespace_name TABLESPACE,               
  (df.total_space_mb - fs.free_space_mb) KULLANILAN_ALAN,              
  fs.free_space_mb BOS_ALAN,              
  ROUND(100 * ((df.total_space - fs.free_space) / df.total_space),2) DOLULUK_ORANI ,

  SYSDATE

FROM (SELECT tablespace_name, SUM(bytes) TOTAL_SPACE,              
      ROUND(SUM(bytes) / 1048576) TOTAL_SPACE_MB              
      FROM dba_data_files              
      GROUP BY tablespace_name) df,              
     (SELECT tablespace_name, SUM(bytes) FREE_SPACE,              
       ROUND(SUM(bytes) / 1048576) FREE_SPACE_MB              
       FROM dba_free_space              
       GROUP BY tablespace_name) fs              
WHERE df.tablespace_name = fs.tablespace_name(+)              
ORDER BY fs.tablespace_name;

Answer 3

您可以通过以下方式获取当天：

select ..., trunc(sysdate) from ...

回答你的问题。我还想推荐两件事：1。使用新的连接语法（左外连接而不是（+）运算符），2。尽可能晚地除以避免舍入错误。将2.4舍入到3和1.4舍入为1会给你3-1 = 2而不是舍入（2.6-1.4）= 1。

select
  tablespace_name as tablespace,
  round((df.total_space_mb - fs.free_space_mb) / 1048576) as kullanilan_alan,
  round(fs.free_space / 1048576) as bos_alan,
  round((df.total_space - fs.free_space) / df.total_space * 100, 2) as doluluk_orani
  -- , trunc(sysdate) as current_day
from
(
  select tablespace_name, sum(bytes) as total_space
  from dba_data_files
  group by tablespace_name
) df
left outer join
(
  select tablespace_name, sum(bytes) as free_space
  from dba_free_space
  group by tablespace_name
) fs
using (tablespace_name = tablespace_name)
order by tablespace_name;

将列插入另一个表

3 个答案: