如何获取特定行的计数

Question

我有包含 Id、Date 和 Status 的表，即打开/关闭 我只想要一个包含按月打开、关闭和 Id 总数的 sql 结果 例如一月打开计数 15，关闭计数 5 和总计数 20

Answer 1

使用 RollUp() 和 Group By 如下：

;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]

输出：

注意：如果需要逐月单行数据，则应用 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)