Question

假设我有温度记录，其中包含以下形式的记录：

年，日，温度

我希望每年的第一天温度超过100℃。现在我可以使用下面的一组查询得到它...有没有办法将它组合成一个查询？

select day,year from t
where temperature>100 and year=2000
order by day limit 1;

select day,year from t
where temperature>100 and year=2001
order by day limit 1;

select day,year from t
where temperature>100 and year=2002
order by day limit 1;

select day,year from t
where temperature>100 and year=2003
order by day limit 1;

Answer 1

select year, min(day) as first_day
from t
where temperature > 100
group by year
order by year

加入一个类别

1 个答案: