最近剛在搞一個BI的項目，里面需要大量的sql 數據統計相關運用，加深了我又對SQL的理解與使用。

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所以，分享幾個數據統計時常用的sql 語句總結：?

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1. 統計各個條件下的數據

select BatchId,sum(CardSum) 總金額, sum(case when Status=1 then CardSum else 0 end) as 已使用, sum(case when Status=2 then CardSum else 0 end) as 已凍結 from GiftCard group by BatchId

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2. 統計每日,每月,每年的數據

select year(AddTime) 年,month(AddTime) 月,day(AddTime) 日,COUNT(1) 數量,sum(CardSum) 銷售合計 from GiftCard group by year(AddTime),month(AddTime),day(AddTime)

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3. 某列去重統計

select COUNT(BatchId),COUNT(distinct BatchId),COUNT(distinct BatchName) from GiftCard

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4. 行轉列

SELECT * FROM (SELECT BatchName, CardSum as TotAmount FROM GiftCard) as s PIVOT ( SUM(TotAmount)FOR BatchName IN (zx測試商品, test新人優惠券,測試高考大放送) )AS MyPivot

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5. 得到表中最小的未使用的ID號

SELECT (CASE WHEN EXISTS(SELECT * FROM GiftCard b WHERE b.Id = 1) THEN MIN(Id) + 1 ELSE 1 END) as Id FROM GiftCardWHERE NOT Id IN (SELECT a.Id - 1 FROM GiftCard a)

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6. 查詢某一列數據不重復的數量

select *
from GiftCard a
where not exists(select 1 from GiftCard where BatchName=a.BatchName and ID<a.ID)

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7.?按年統計1月到12個月的銷量

select year(AddTime) as '年', SUM(case when MONTH(AddTime)=1 then CardSum else 0 end ) as '一月', SUM(case when MONTH(AddTime)=2 then CardSum else 0 end ) as '二月', SUM(case when MONTH(AddTime)=3 then CardSum else 0 end ) as '三月', SUM(case when MONTH(AddTime)=4 then CardSum else 0 end ) as '四月', SUM(case when MONTH(AddTime)=5 then CardSum else 0 end ) as '五月', SUM(case when MONTH(AddTime)=6 then CardSum else 0 end ) as '六月', SUM(case when MONTH(AddTime)=7 then CardSum else 0 end ) as '七月', SUM(case when MONTH(AddTime)=8 then CardSum else 0 end ) as '八月', SUM(case when MONTH(AddTime)=9 then CardSum else 0 end ) as '九月', SUM(case when MONTH(AddTime)=10 then CardSum else 0 end ) as '十月', SUM(case when MONTH(AddTime)=11 then CardSum else 0 end ) as '十一月', SUM(case when MONTH(AddTime)=12 then CardSum else 0 end ) as '十二月'from GiftCardgroup by year(AddTime)

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作者：章為忠?
出處：http://www.fpeach.com/?
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