Question

我有一个带有类似列的表：

+-------+------+-------+-------+-------+-------+
| age1  | val1 | age2  | val2  | age3  | val3  |
+-------+------+-------+-------+-------+-------+
| 30-40 | 34.5 | 41-50 | 32.01 | 51-60 | 29.13 |
+-------+------+-------+-------+-------+-------+

我想返回：

+-------+-------+
|  age  |  val  |
+-------+-------+
| 30-40 |  34.5 |
| 41-50 | 32.01 |
| 51-60 | 29.13 |
+-------+-------+

我最终使用3个并集编写了一个大型查询，但这似乎不正确：

  select *
  from ( ... ) g1
  union
  select *
  from ( ... ) g2
  union
  select *
  from ( ... ) g3

有没有办法做到这一点？似乎我遗漏了一些明显的东西。

Answer 1

在Postgres中，您可以通过横向联接将列有效地取消透视成行：

# without -Raw you get the content as string array
$body = (Get-Content -Path 'C:\log.log') -join '<br />'
Send-MailMessage -Body $body -BodyAsHtml ...

Postgres，将单行拆分为多行

1 个答案: