sql - how to query the occuring time of the max wind from a database?

Question

I want to find the occuring time of the max wind, the max wind, and total rain from a database. The database have three columns: observerTime, wind and rain, how to generate the SQL statement to get the result ?

Answer 1

select observerTime from t where wind = (select max(wind) from t)

or if you need the last date when it occures

select max(observerTime) from t where wind = (select max(wind) from t)

Answer 2

您没有提到数据库，但以下其中一项可能会起作用：

select top 1 *, (select sum(rain) from t) as TotalRain
order by wind desc

或者：

select *, (select sum(rain) from t) as TotalRain
from t
order by wind desc
limit 1

或者

select *, (select sum(rain) from t) as TotalRain
from (select *
      from t
      order by wind desc
     ) t
where rownum = 1

Answer 3

你应该能够使用这样的东西：

select t1.observerTime, 
  t1.wind, 
  (select sum(rain) from yourtable) TotalRain
from yourtable t1
inner join
(
  select max(wind) MaxWind
  from yourtable
) t2
  on t1.wind = t2.maxwind

请参阅带有演示的 SQL Fiddle

由于您使用的是 SQL Server，因此您还可以使用row_number()：

select observertime,
  wind,
  (select sum(rain) from yourtable) TotalRain
from
(
  select observertime,
    wind,
    rain,
    row_number() over(order by wind desc) rn
  from yourtable
) src
where rn = 1

请参阅带有演示的 SQL Fiddle