已經有快2個月沒有更新部落格了,實在是因為最近發生了太多的事情,辭了工作,在湘雅醫院待了一個多月,然後又新換了工作......
在平時的工作中,Sqlserver中許多知識點是經常用到的,但是有時候我們往往忽略了它們,在過去的一年裡,一直使用的是Mysql,現在又開始接觸Sqlserver了,是以就把一些常用又容易忽視的Sqlserver知識點總結一點,以便備忘之用。
所有的操作都将基于Northwind資料庫來進行操作。
注意:當采用附加Northwind資料庫的方式進行資料庫遷移的時候,可能會出現錯誤:“Access is denied”。解決方案: right-click the SQL Server Management Studio icon and select Run as administrator。
資料線上Mock位址:https://www.mockaroo.com/
SET NOCOUNT ON 介紹
在存儲過程中,經常用到SET NOCOUNT ON;
作用:阻止在結果集中傳回顯示受T-SQL語句或則usp影響的行計數資訊。
當SET NOCOUNT ON 時候,不傳回計數,當SET NOCOUNT OFF時候,傳回計數。
當SET NOCOUNT ON 時候,會更新@@RowCount,但是不向用戶端發送存儲過程每個語句的DONE_IN_proc消息。
如果存儲過程中包含一些并不傳回實際資料的語句,使用SET NOCOUNT ON時,網絡通信流量便會大量減少,可以顯著提高應用程式性能。
SET NOCOUNT 指定的設定隻在執行或運作時候生效,分析時候不生效。
示例:
USE Northwind
GO
SET NOCOUNT OFF;
SELECT TOP 5 OrderDate FROM Orders
GO
執行結果如下:

USE Northwind
GO
SET NOCOUNT ON;
SELECT TOP 5 OrderDate FROM Orders
GO

Go 介紹
如果隻是執行一條語句,有沒有GO都一樣。
如果多條語句之間用GO分隔開就不一樣了。
每個被GO分隔的語句都是一個單獨的事務,一個語句執行失敗不會影響其它語句執行。
GO 不是 Transact-SQL 語句;而是可為 SQL Server 查詢分析器識别的指令。
如果你的SQL過長的時候,就要寫GO,或者有一些語句,它隻能是第一句操作的,在之前你也得寫 GO ,GO的意思是分批處理語句,有加這個 GO ,就執行GO 行的代碼,執行後再執行接下來的代碼。
像以下這種情況下就要用到GO ,以達到分批處理資料的目的,否則将會報錯。
IF EXISTS(SELECT 1 FROM sys.views WHERE name='View_OrderInfo')
DROP VIEW View_OrderInfo
create view View_OrderInfo
as
select c.ContactName,c.CompanyName,o.OrderDate,o.ShipName,o.OrderID,o.Freight from [Orders] o inner join Customers c on o.CustomerID=c.CustomerID
會報錯
必須是:
IF EXISTS(SELECT 1 FROM sys.views WHERE name='View_OrderInfo')
DROP VIEW View_OrderInfo
GO
create view View_OrderInfo
as
select c.ContactName,c.CompanyName,o.OrderDate,o.ShipName,o.OrderID,o.Freight from [Orders] o inner join Customers c on o.CustomerID=c.CustomerID
select count(*) count(1) count(2) count('a') 之間的差別
count(*):找表中最短的列進行統計行數
count(1) count(2) count('a'):對常數列進行統計行數。它們的執行方式是一樣的,沒有任何差別。
很顯然采用count(1) count(2) count('a')的方式,效率會更高,因為count(*)會先去算出最短的列,然後再去統計。雖然現在的Sqlserver查詢分析器自動會幫我們做一些優化,但是我們必須知道它們的實作原理。
WITH (NOLOCK)
缺點:
1.會産生髒讀
2.隻适用于select查詢語句
優點:
1.有些文章說,加了WITH (NOLOCK)的SQL查詢效率可以增加33%。
2.可以用于inner join 或者left join等語句
髒讀: 一個使用者對一個資源做了修改,此時另外一個使用者正好讀取了這條被修改的記錄,然後,第一個使用者放棄修改,資料回到修改之前,這兩個不同的結果就是髒讀。
詳細内容:
要提升SQL的查詢效能,一般來說大家首先會考慮建立索引(index)。其實除了index的建立之外,當我們在下SQL Command時,在文法中加一段WITH (NOLOCK)可以改善線上大量查詢的環境中資料集被LOCK的現象藉此改善查詢的效能。
不過有一點千萬要注意的就是,WITH (NOLOCK)的SQL SELECT有可能會造成Dirty Read(髒讀)。
例如:
SELECT o.OrderID,o.OrderDate,o.Freight,d.Quantity,d.UnitPrice
FROM [dbo].[Orders] o WITH (NOLOCK)
JOIN [dbo].[Order Details] d WITH (NOLOCK)
ON o.OrderID=d.OrderID
DELETE、INSERT、UPDATE這些需要transaction的指令就不能使用WITH (NOLOCK)。
加了WITH (NOLOCK)即告訴SQL Server,我們的這段SELECT指令無需去考慮目前table的transaction lock狀态,是以效能上會有明顯的提升,而且資料庫系統的Lock現象會有明顯的減少(包含Dead Lock)。
當使用NoLock時,它允許閱讀那些已經修改但是還沒有交易完成的資料。是以如果有需要考慮transaction事務資料的實時完整性時,使用WITH (NOLOCK)就要好好考慮一下。
如果不需考慮transaction,WITH (NOLOCK)或許是個好用的參考。
Sqlserver高效分頁
在SQLserver2012之前,分頁我們一般是使用ROW_NUMBER()。以擷取第11條到第50條資料為例:
ROW_NUMBER()的實作方式:
select * from (
select *, ROW_NUMBER() OVER(Order by a.OrderID DESC ) AS RowNumber from Orders as a
) as b
where RowNumber BETWEEN 11 and 50
SQLserver2012中OFFSET & FETCH實作方式:
SELECT o.* FROM dbo.Orders o
ORDER BY o.OrderID DESC OFFSET 10 ROWS FETCH NEXT 40 ROWS ONLY
OFFSET & FETCH實作方式 更加精簡更加高效。
使用 OFFSET-FETCH 中的限制
- ORDER BY 是使用 OFFSET 和 FETCH 子句所必需的。
- OFFSET 子句必須與 FETCH 一起使用。永遠不能使用 ORDER BY … FETCH。
- TOP 不能在同一個查詢表達式中與 OFFSET 和 FETCH 一起使用。
- OFFSET/FETCH 行計數表達式可以是将傳回整數值的任何算術、常量或參數表達式。該行計數表達式不支援标量子查詢
Sqlserver中一直在用又經常被忽略的知識點一 Sqlserver中一直在用又經常被忽略的知識點一
View CodeALTER PROCEDURE getLightningSendOverTimeOrder --閃電送到期存儲過程 (@OverTimeMinutes INT,--逾時時間門檻值 @GetLasterDay int --取最近多少天的訂單 ) As DECLARE @sql NVARCHAR(MAX); BEGIN set nocount on; set @Sql= N'WITH OrderInfo --查詢近一天的,處理逾時的閃電送訂單 AS ( SELECT ID , CommunityId , SubOrderNumber FROM dbo.[Order] WITH ( NOLOCK ) WHERE DATEDIFF(day, CreatedOn, GETDATE()) <= @GetLasterDay AND DATEDIFF(mi, CreatedOn, ModifiedOn) > @OverTimeMinutes AND LightningSend = 1 AND IsDeleted = 0 --待付款(商品訂單),待确認(商品訂單),待發貨(商品訂單),待收貨(商品訂單) AND OrderStatusId IN ( ''C2EE784F-F29B-4E18-8D73-761264339005'', ''FA1A31DF-3855-41BB-9F5C-A09F3AB4C408'', ''ACF190B2-0CA2-43A0-8E6B-70DF8521F4C5'', ''15F06407-C82C-4CA8-984E-37FB3BD9963C'' ) ), SmsOrder --沒有發送過資訊的訂單 AS ( SELECT o.ID , o.CommunityId , o.SubOrderNumber FROM OrderInfo o WITH ( NOLOCK ) where not EXISTS(SELECT 1 FROM [dbo].[Sms_LightningSendOrderOverTime] lso WITH ( NOLOCK ) WHERE o.SubOrderNumber = lso.SubOrderNumber) ), SmsOrderInfo AS ( SELECT so.CommunityId , so.SubOrderNumber , p.PublisherId , c.ConvenienceStoreID , oi.ProductId , p.CategoryId , p.ProcessType FROM SmsOrder AS so WITH ( NOLOCK ) INNER JOIN Community c WITH ( NOLOCK ) ON so.CommunityId = c.ID INNER JOIN dbo.OrderItem oi WITH ( NOLOCK ) ON so.ID = oi.OrderId INNER JOIN dbo.Product p WITH ( NOLOCK ) ON oi.ProductId = p.Id AND p.LightningSend = 1 AND p.ProcessType != 1 -- 便利店 ), MerchantSmsOrderInfo AS ( SELECT so.CommunityId , so.SubOrderNumber , p.PublisherId , c.ConvenienceStoreID , oi.ProductId , p.CategoryId , p.ProcessType FROM SmsOrder AS so WITH ( NOLOCK ) INNER JOIN Community c WITH ( NOLOCK ) ON so.CommunityId = c.ID INNER JOIN dbo.OrderItem oi WITH ( NOLOCK ) ON so.ID = oi.OrderId INNER JOIN dbo.Product p WITH ( NOLOCK ) ON oi.ProductId = p.Id AND p.LightningSend = 1 AND p.ProcessType = 1 -- 商家 ), ResultInfo AS ( SELECT usr.Id AS UserId , soi.SubOrderNumber , usr.PhoneNumber FROM SmsOrderInfo AS soi INNER JOIN dbo.[User] AS usr WITH ( NOLOCK ) ON soi.ConvenienceStoreID = usr.OrgId INNER JOIN dbo.Organization org WITH ( NOLOCK ) ON usr.OrgId = org.Id AND org.Levels = 2 --便利店 INNER JOIN OrderDistributaryCategoryRelation AS odcr WITH ( NOLOCK ) ON usr.Id = odcr.MerchantUserId AND odcr.CategoryType = 1 AND odcr.SellerId = soi.ConvenienceStoreID AND odcr.CategoryId = soi.CategoryId INNER JOIN OrderDistributary AS odb WITH ( NOLOCK ) ON usr.Id = odb.MerchantUserId AND odb.SellerId = soi.ConvenienceStoreID INNER JOIN OrderDistributaryRelation AS odbr WITH ( NOLOCK ) ON usr.Id = odbr.MerchantUserId AND odbr.MerchantId = soi.ConvenienceStoreID UNION ALL SELECT u.Id AS UserId , soi.SubOrderNumber , u.PhoneNumber FROM dbo.[User] u WITH ( NOLOCK ) INNER JOIN OrderDistributary odb WITH ( NOLOCK ) ON u.Id = odb.MerchantUserId AND odb.IsDefault = 1 INNER JOIN SmsOrderInfo soi WITH ( NOLOCK ) ON odb.SellerId = soi.ConvenienceStoreID ------------------------------商家----------------------------- UNION ALL SELECT usr.Id AS UserId , soi.SubOrderNumber , usr.PhoneNumber FROM MerchantSmsOrderInfo AS soi INNER JOIN dbo.[User] AS usr WITH ( NOLOCK ) ON soi.ConvenienceStoreID = usr.OrgId INNER JOIN dbo.Organization org WITH ( NOLOCK ) ON usr.OrgId = org.Id AND org.Levels = 1 --商家 INNER JOIN OrderDistributaryCategoryRelation AS odcr WITH ( NOLOCK ) ON usr.Id = odcr.MerchantUserId AND odcr.CategoryType = 1 AND odcr.CategoryId = soi.CategoryId INNER JOIN OrderDistributary AS odb WITH ( NOLOCK ) ON usr.Id = odb.MerchantUserId AND odb.SellerId = soi.PublisherId INNER JOIN OrderDistributaryRelation AS odbr WITH ( NOLOCK ) ON odcr.MerchantUserId = odbr.MerchantUserId AND odbr.MerchantId = soi.ConvenienceStoreID UNION ALL SELECT u.Id AS UserId , soi.SubOrderNumber , u.PhoneNumber FROM MerchantSmsOrderInfo soi WITH ( NOLOCK ) INNER JOIN OrderDistributary odb WITH ( NOLOCK ) ON odb.SellerId = soi.PublisherId AND odb.IsDefault = 1 AND odb.IsDeleted = 0 INNER JOIN dbo.[User] u WITH ( NOLOCK ) ON u.Id = odb.MerchantUserId ) SELECT r.SubOrderNumber , r.UserId, r.PhoneNumber FROM ResultInfo r ' exec sp_executesql @Sql,N'@OverTimeMinutes int,@GetLasterDay int',@OverTimeMinutes,@GetLasterDay; SET NOCOUNT OFF; END
自己寫的一個存儲過程例子
--------------------------------------建立閃電送存儲過程-----------------------------------
IF EXISTS(Select Name From Sysobjects Where Name='getLightningSendOverTimeOrder' And Xtype='P')
DROP PROCEDURE [dbo].getLightningSendOverTimeOrder
GO
CREATE PROCEDURE getLightningSendOverTimeOrder --閃電送到期存儲過程
(@OverTimeMinutes INT,--逾時時間門檻值
@GetLasterDay int --取最近多少天的訂單
)
As
DECLARE @sql NVARCHAR(MAX);
BEGIN
set nocount on;
set @Sql=
N'WITH OrderInfo
--查詢近一天的,處理逾時的閃電送訂單
AS ( SELECT ID ,
CommunityId ,
SubOrderNumber
FROM dbo.[Order] WITH ( NOLOCK )
WHERE DATEDIFF(day, CreatedOn, GETDATE()) <= @GetLasterDay
AND DATEDIFF(mi, CreatedOn, ModifiedOn) > @OverTimeMinutes
AND LightningSend = 1
AND IsDeleted = 0
--待付款(商品訂單),待确認(商品訂單),待發貨(商品訂單),待收貨(商品訂單)
AND OrderStatusId IN (
''C2EE784F-F29B-4E18-8D73-761264339005'',
''FA1A31DF-3855-41BB-9F5C-A09F3AB4C408'',
''ACF190B2-0CA2-43A0-8E6B-70DF8521F4C5'',
''15F06407-C82C-4CA8-984E-37FB3BD9963C'' )
UNION ALL
--狀态一直是待支付狀态的
SELECT ID ,
CommunityId ,
SubOrderNumber
FROM dbo.[Order] WITH ( NOLOCK )
WHERE DATEDIFF(day, CreatedOn, GETDATE()) <=@GetLasterDay
AND LightningSend = 1
AND IsDeleted = 0
AND (OrderStatusId =''ACF190B2-0CA2-43A0-8E6B-70DF8521F4C5'' AND DATEDIFF(mi, CreatedOn, GETDATE()) >@OverTimeMinutes)
),
SmsOrder
--需要發送過資訊的訂單
AS ( SELECT o.ID ,
o.CommunityId ,
o.SubOrderNumber
FROM OrderInfo o WITH ( NOLOCK )
where not EXISTS(SELECT 1 FROM [dbo].[Sms_LightningSendOrderOverTime] lso
WITH ( NOLOCK ) WHERE o.SubOrderNumber = lso.SubOrderNumber)
),
SmsOrderInfo
AS ( SELECT
so.CommunityId ,
so.SubOrderNumber ,
p.PublisherId ,
c.ConvenienceStoreID ,
oi.ProductId ,
p.CategoryId ,
p.ProcessType
FROM SmsOrder AS so WITH ( NOLOCK )
INNER JOIN Community c WITH ( NOLOCK ) ON so.CommunityId = c.ID
INNER JOIN dbo.OrderItem oi WITH ( NOLOCK ) ON so.ID = oi.OrderId
INNER JOIN dbo.Product p WITH ( NOLOCK ) ON oi.ProductId = p.Id
AND p.LightningSend = 1
AND p.ProcessType != 1 -- 便利店
),
MerchantSmsOrderInfo
AS ( SELECT
so.CommunityId ,
so.SubOrderNumber ,
p.PublisherId ,
c.ConvenienceStoreID ,
oi.ProductId ,
p.CategoryId ,
p.ProcessType
FROM SmsOrder AS so WITH ( NOLOCK )
INNER JOIN Community c WITH ( NOLOCK ) ON so.CommunityId = c.ID
INNER JOIN dbo.OrderItem oi WITH ( NOLOCK ) ON so.ID = oi.OrderId
INNER JOIN dbo.Product p WITH ( NOLOCK ) ON oi.ProductId = p.Id
AND p.LightningSend = 1
AND p.ProcessType = 1 -- 商家
),
ResultInfo
AS (
SELECT usr.Id AS UserId ,
soi.SubOrderNumber ,
usr.PhoneNumber
FROM SmsOrderInfo AS soi
INNER JOIN dbo.[User] AS usr WITH ( NOLOCK ) ON soi.ConvenienceStoreID = usr.OrgId
INNER JOIN dbo.Organization org WITH ( NOLOCK ) ON usr.OrgId = org.Id
AND org.Levels = 2 --便利店
INNER JOIN OrderDistributaryCategoryRelation AS odcr
WITH ( NOLOCK ) ON usr.Id = odcr.MerchantUserId
AND odcr.CategoryType = 1
AND odcr.SellerId = soi.ConvenienceStoreID
AND odcr.CategoryId = soi.CategoryId
INNER JOIN OrderDistributary AS odb WITH ( NOLOCK ) ON usr.Id = odb.MerchantUserId
AND odb.SellerId = soi.ConvenienceStoreID
INNER JOIN OrderDistributaryRelation AS odbr WITH ( NOLOCK ) ON usr.Id = odbr.MerchantUserId
AND odbr.MerchantId = soi.ConvenienceStoreID
UNION ALL
SELECT u.Id AS UserId ,
soi.SubOrderNumber ,
u.PhoneNumber
FROM dbo.[User] u WITH ( NOLOCK )
INNER JOIN OrderDistributary odb WITH ( NOLOCK ) ON u.Id = odb.MerchantUserId
AND odb.IsDefault = 1
INNER JOIN SmsOrderInfo soi WITH ( NOLOCK ) ON odb.SellerId = soi.ConvenienceStoreID
------------------------------商家-----------------------------
UNION ALL
SELECT usr.Id AS UserId ,
soi.SubOrderNumber ,
usr.PhoneNumber
FROM MerchantSmsOrderInfo AS soi
INNER JOIN dbo.[User] AS usr WITH ( NOLOCK ) ON soi.ConvenienceStoreID = usr.OrgId
INNER JOIN dbo.Organization org WITH ( NOLOCK ) ON usr.OrgId = org.Id
AND org.Levels = 1 --商家
INNER JOIN OrderDistributaryCategoryRelation AS odcr
WITH ( NOLOCK ) ON usr.Id = odcr.MerchantUserId
AND odcr.CategoryType = 1
AND odcr.CategoryId = soi.CategoryId
INNER JOIN OrderDistributary AS odb WITH ( NOLOCK ) ON usr.Id = odb.MerchantUserId
AND odb.SellerId = soi.PublisherId
INNER JOIN OrderDistributaryRelation AS odbr WITH ( NOLOCK ) ON odcr.MerchantUserId = odbr.MerchantUserId
AND odbr.MerchantId = soi.ConvenienceStoreID
UNION ALL
SELECT u.Id AS UserId ,
soi.SubOrderNumber ,
u.PhoneNumber
FROM MerchantSmsOrderInfo soi WITH ( NOLOCK )
INNER JOIN OrderDistributary odb WITH ( NOLOCK ) ON odb.SellerId = soi.PublisherId
AND odb.IsDefault = 1
AND odb.IsDeleted = 0
INNER JOIN dbo.[User] u WITH ( NOLOCK ) ON u.Id = odb.MerchantUserId
)
SELECT r.SubOrderNumber ,
r.UserId,
r.PhoneNumber
FROM ResultInfo r '
exec sp_executesql @Sql,N'@OverTimeMinutes int,@GetLasterDay int',@OverTimeMinutes,@GetLasterDay;
SET NOCOUNT OFF;
END
GO
demo2:分頁存儲過程
------------------------------------------建立我的優惠券存儲過程 created by zouqj-2017-3-1-----------------------------------
IF EXISTS(Select Name From Sysobjects Where Name='usp_GetMyCouponsList' And Xtype='P')
DROP PROCEDURE usp_GetMyCouponsList
GO
CREATE PROC usp_GetMyCouponsList
(
@PageIndex int, --頁碼
@PageSize int, --
@hostName nvarchar(100),--伺服器位址
@MemberID UNIQUEIDENTIFIER, --會員ID
@IsGetTotalInfo BIT, --是否得到統計資訊,1為得到統計資訊,0為不得到統計資訊,傳回記錄集
@HasStatus BIT, -- 是否有狀态
@CouponsStatus INT --優惠券狀态
)
AS
----------------------------------------定義參數--------------------------------------
declare @strSql NVARCHAR(max);
DECLARE @IsUseCount INT
DECLARE @ExpiredCount INT
DECLARE @NoUseCount INT
DECLARE @where NVARCHAR(100);
set nocount on;
----------------------------------------SQL開始--------------------------------------
IF @HasStatus=1
BEGIN
SET @where='m.[State]=@CouponsStatus';
END
ELSE
BEGIN
SET @where='1=1'
END
IF @IsGetTotalInfo=0
BEGIN
SET @strSql=N'SELECT DISTINCT t.* FROM (SELECT m.[State] AS [STATUS],
m.CouponCode AS CouponsCode,
m.CampaignID AS CampaignID,
c.Code as CampaignCode,
c.Name AS CampaignName,
b.ValidityStartTime AS CampaignStartTime,
b.ValidityEndTime AS CampaignEndTime,
c.Price as CouponsAmount,
(CASE WHEN c.IsLimited =1 THEN 1 ELSE 2 END ) as IsLimited,
c.FullAmount as MinAmount,
e.[Type] AS CouponsType,
(CASE WHEN b.IconUrl IS NULL THEN N'''' WHEN b.IconUrl=N'''' THEN N'''' ELSE @hostName+b.IconUrl END) AS IconUrl
FROM Loy_MemberCoupon m WITH ( NOLOCK ) INNER JOIN
[dbo].[MK_Campaign] AS a WITH ( NOLOCK ) ON m.CampaignID=a.ID AND m.MemberID=@MemberID AND '+@where+'
LEFT OUTER JOIN [dbo].[MK_CouponConfig] AS b WITH ( NOLOCK ) ON a.[ID] = b.[CampaignID]
LEFT OUTER JOIN [dbo].[MK_Coupon] AS c WITH ( NOLOCK ) ON b.[CouponID] = c.[ID]
LEFT OUTER JOIN [dbo].[MK_CouponRestriction] AS d WITH ( NOLOCK ) ON c.[ID] = d.[CompainID]
LEFT OUTER JOIN [dbo].[MK_CouponRestrictCategory] AS e WITH ( NOLOCK ) ON d.[ID] = e.[CouponRestrictionID]
) t
ORDER BY t.CampaignEndTime
offset (@PageIndex-1)*@PageSize ROWS FETCH NEXT @PageIndex*@PageSize ROWS ONLY'
exec sp_executesql @strSql,N'@PageIndex int,@PageSize int,@hostName nvarchar(100),@MemberID UNIQUEIDENTIFIER,@where NVARCHAR(100),@CouponsStatus int',@PageIndex=@PageIndex,@PageSize=@PageSize,@hostName=@hostName,@MemberID=@MemberID,@where=@where,@CouponsStatus=@CouponsStatus
END
ELSE
BEGIN
-------------------------------------------------------------
SELECT @IsUseCount=COUNT(1) FROM (SELECT DISTINCT m.CouponCode
FROM Loy_MemberCoupon m WITH ( NOLOCK ) WHERE m.MemberID=@MemberID AND m.[State]=2
) t
SELECT @ExpiredCount=COUNT(1) FROM (SELECT DISTINCT m.CouponCode
FROM Loy_MemberCoupon m WITH ( NOLOCK ) WHERE m.MemberID=@MemberID AND m.[State]=3
) t
SELECT @NoUseCount=COUNT(1) FROM (SELECT DISTINCT m.CouponCode
FROM Loy_MemberCoupon m WITH ( NOLOCK ) WHERE m.MemberID=@MemberID AND m.[State]=1
) t
SELECT @IsUseCount AS IsUseCount,@ExpiredCount AS ExpiredCount,@NoUseCount AS NoUseCount
END
----------------------------------------SQL結束--------------------------------------
set nocount off;
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