Question

我想要一个查询，只选择那些有指定年份数据的月份，但我不太清楚如何实现这一目标。这是我到目前为止所得到的：

select MONTH(DateRaised) as 'Month'
from Complaints
where
    (select COUNT(*)
     from Complaints
     where YEAR(DateRaised) = 2000) > 0
group by MONTH(dateraised)
order by MONTH(dateraised)

因此，如果我的数据在2000年的5月，8月和12月有投诉，那么我只希望5, 8 and 12出现在我的查询中，这可能吗？

Answer 1

select MONTH(DateRaised) as 'Month'
from Complaints
where YEAR(DateRaised) = 2000
ORDER BY MONTH(dateraised)

Answer 2

select DISTINCT MONTH(DateRaised) AS 'Month'
from Complaints
where YEAR(DateRaised) = 2000

Answer 3

SELECT MONTH(DateRaised) as 'Month', COUNT(*) AS count
FROM Complaints
WHERE YEAR(DateRaised) = 2000
GROUP BY MONTH(dateraised)
ORDER BY MONTH(dateraised)

仅选择具有指定年份数据的月份

3 个答案: