如何獲取特定月份的數據sql

Question

我有一個包含admission_date和student_status列的學生表，我想獲得特定年份的每個月的全部入場許可，而admission_date列類型是DateTime。即

**Month**  **Total_Admission** 
Jan-2016    90 
Feb-2016    70 
Mar-2016    109 

Answer 1

與下面的查詢嘗試。

SELECT replace(right(convert(varchar, admission_date, 106), 8), ' ', '-') Month,COUNT(*) TotalAdmissions 
FROM yourTable 
WHERE YEAR(admission_date) = 2016 
GROUP BY replace(right(convert(varchar, admission_date, 106), 8), ' ', '-') 

Answer 2

您可以使用extract(year_month...檢索每月統計。事情是這樣的：

SELECT 
    extract(year_month FROM date(admission_date)) month, 
    count(*) total_admission 
FROM your_table; 

Answer 3

嘗試這樣做：

SELECT COUNT(*) AS admission_total 
FROM yourTable 
GROUP BY MONTH(admission_date) 

Answer 4

試試這個：

SELECT LEFT(DATENAME(MONTH,admission_date),3)+'-2016' as MonthNumber,COUNT(*) TotalAdmissions 
FROM TableName 
WHERE YEAR(admission_date) = 2016 
GROUP BY LEFT(DATENAME(MONTH,admission_date),3)+'-2016'