如何獲得特定行的計數

Question

我有包含Id，Date和Status的表，即打開/關閉，我只想在sql中包含按月打開，關閉和Id的總計數的結果，例如，在一月打開計數15，關閉計數5和總計數20

Answer 1

使用RollUp（）和分組依據，如下所示：

;WITH T AS
(
    SELECT
        Id,     
        DATENAME(MONTH,[Date]) AS [MonthName],          
        Status
    FROM @tblTest
)
SELECT
    [MonthName],
    [Status],
    StatusCount
FROM
(
    SELECT
        MonthName,
        CASE ISNULL(Status,'') WHEN '' THEN 'Total' ELSE Status END AS Status,          
        Count(Status) AS StatusCount                        
    FROM T
    GROUP BY ROLLUP([MonthName],[Status])
)X
WHERE X.MonthName IS NOT NULL
ORDER BY X.[MonthName],X.[Status]

輸出：

注意：如果需要的數據按月單行顯示，則應用PIVOT

Answer 2

select year(date), month(date), 
       sum(case when status = 'open' then 1 else 0 end) as open_count,
       sum(case when status = 'closed' then 1 else 0 end) as closed_count,
       count(*) as total_count
from your_table
group by year(date), month(date)