分組統計查詢(章節摘要),分組統計章節摘要

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分組統計查詢(章節摘要),分組統計章節摘要
1,在SQL中主要提供了5種分組函數,分別是COUNT(),AVG(),SUM(),MIN(),MAX()函數。


2,使用GROUP BY字句可以對資料進行分組操作,而使用HAVING字句可以對分組之後的資料進行再次過濾。


3,在分組時可以同時制定多個分組欄位。


4,分組操作不僅可以用於實體表,也可以針對查詢的暫存資料表進行分組。


5,分組函數允許嵌套,但是嵌套之後的分組查詢中不能再出現任何欄位,包括分組欄位。
SQL分組查詢統計查詢語句

select statues ,count(*) as number from FeedbackResults
group by statues
 
進階sql 分組查詢統計

SELECT
門店, MONTH(時間) AS 月 , SUM( 資料1) AS 資料1, SUM( 資料2) AS 資料2
FROM

GROUP BY
門店, MONTH(時間),
 

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