返回postgresql查询中的嵌套操作小时数

时间:2014-09-08 20:23:11

标签: sql postgresql

我有一张车库的桌子。我允许API查询,该查询也应该能够返回车库的运行时间。操作时间与TimeBlock表中的车库有关。

TimeBlock表:

  • open_at
  • close_at
  • day_of_week(0-6)
  • is_24hr
  • is_closed
  • garage_id

这是我当前的查询。有没有办法增强它还能为每个Garage表返回7个TimeBlock条目?

select g.name, bool_or(c.garage_id is not null)
from
    garage g
    left join
    car c on g.garage_id = c.garage_id
group by g.name

数据示例:


GarageA(id = 10)

name =“gA”

TimeBlock:

  • open_at = 800
  • close_at = 2000
  • day_of_week = 0
  • is_24hr = false
  • is_closed = false
  • garage_id = 10

TimeBlock:

  • open_at = 800
  • close_at = 2000
  • day_of_week = 1
  • is_24hr = false
  • is_closed = false
  • garage_id = 10

等。 (X7)

GarageB(id = 20)

name =“gB”

TimeBlock:

  • open_at = 800
  • close_at = 2000
  • day_of_week = 0
  • is_24hr = false
  • is_closed = false
  • garage_id = 20

TimeBlock:

  • open_at = 800
  • close_at = 2000
  • day_of_week = 1
  • is_24hr = false
  • is_closed = false
  • garage_id = 20

等。 (X7)

谢谢!

0 个答案:

没有答案
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