USE TemporalProductInventory; GO BEGIN --If table is system-versioned, SYSTEM_VERSIONING must be set to OFF first IF ((SELECT temporal_type FROM SYS.TABLES WHERE object_id = OBJECT_ID('dbo.ProductInventory', 'U')) = 2) BEGIN ALTER TABLE [dbo].[ProductInventory] SET (SYSTEM_VERSIONIN...
通过查询show status like 'Innodb_buffer_pool_read%',保证 (Innodb_buffer_pool_read_requests – Innodb_buffer_pool_reads) / Innodb_buffer_pool_read_requests越高越好。 innodb_additional_mem_pool_size:InnoDB存储引擎用来存放数据字典信息以及一些内部数据结构的内存空间大小,当数据库对象非常多的时候,适当...
-- Uses AdventureWorksPDW --First, create a statistics object CREATE STATISTICS Customer_LastName ON AdventureWorksPDW2012.dbo.DimCustomer (LastName); GO DBCC SHOW_STATISTICS ("dbo.DimCustomer", Customer_LastName); GO 结果显示标题、密度矢量和直方图的一部分。另...
-- Uses AdventureWorksDW database --Run CREATE PROCEDURE as the first statement in a batch. CREATE PROCEDURE Get10TopResellers AS BEGIN SELECT TOP (10) r.ResellerName, r.AnnualSales FROM DimReseller AS r ORDER BY AnnualSales DESC, ResellerName ASC; END ; GO --Show 10 Top Resellers EXEC...
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DB2:select m from 1 fetch first n rows only; Oracle:select m from 1 where rownum <=n; 从1表中检索m的列从a行开始的b行的值: select m from 1 limit b offset a; 注释:--注释内容;#注释内容;/*内容*/(多行) 1|02.排序检索数据 ...
would select the first 10 rows of the strinfo table as they are stored in the native database:*/SELECTTOP10*FROMstrinfo/***升序***/SELECTTOP10*FROMstrinfoORDERBYcityASC/***降序***/SELECTTOP10*FROMstrinfoORDERBYcityDESC 3. SMAPLE用法 /*In addition, there is a function available in...
ROWS 指定检索的行的近似 sample_number。 指定 ROWS 时,SQL Server 返回指定的行数的近似值。 指定 ROWS 时,sample_number 表达式的结果必须是大于零的整数值。 REPEATABLE 指示可以再次返回选定的样本。 使用同一个 repeat_seed 值指定时,只要对表中任何行尚未进行更改,SQL Server 就会返回相同的行集。 使用其他...
FETCHFIRST3ROWS ONLY; ADD the ORDER BY Keyword Add theORDER BYkeyword when you want to sort the result, and return the first 3 records of the sorted result. For SQL Server and MS Access: Example Sort the result reverse alphabetically by CustomerName, and return the first 3 records: ...
=First(Fields!Product_Category_Name.Value, "DataSet1") 若要預覽報表,選取 [執行]。報表標題包含第一個產品類別目錄的名稱。 稍後,在您當做鑽研報表執行此報表之後,產品類別目錄名稱將會動態變更,以反映在主報表中按下之產品類別目錄的名稱。5.設定隱藏的參數屬性參數預設是可見的,但不適合此報表。 稍後更新鑽...