FOR SYSTEM_TIME在查詢中,可以針對每個資料表個別指定 。 它可以在通用資料表運算式、資料表值函式和預存程序內使用。 搭配時態表使用資料表別名時,時態表名稱和別名之間必須包含 FOR SYSTEM_TIME 子句(請參閱使用AS OF 次子句查詢特定時間中的第二個範例)。
Without Feature T180, "System-versioned tables", conforming SQL language shall not contain ADD <system time period specification>. Subclause 11.28, "<drop table period definition>": Conformance Rules: Without Feature T180, "System-versioned tables", conforming SQL language shall not c...
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_VERSIONI...
先关闭SYSTEM_VERSIONING,修改历史表名,并再次打开SYSTEM_VERSIONING,即完成了历史表的归档(当然,这样归档的话,归档的那部分数据也就失去了使用FOR SYSTEM_TIME语法查询的能力了): ALTERTABLEMyTableSET(SYSTEM_VERSIONING=OFF);EXECsp_rename'MyTableHistory','MyTableHistory_20170303';ALTERTABLEMyTableSET(SYSTEM_VERS...
To create a system versioned table; --- System versioned table CREATE TABLE Department ( DeptID int NOT NULL PRIMARY KEY CLUSTERED , DeptName varchar(50) NOT NULL , ManagerID INT NULL , ParentDeptID int NULL , SysStartTime datetime2 GENERATED ALWAYS AS ROW START NOT NULL , SysEnd...
Applies to: SQL Server 2016 (13.x) and later Azure SQL Database Azure SQL Managed InstanceTemporal tables (also known as system-versioned temporal tables), are a database feature that brings built-in support for providing information about data stored in the table at any point in time, rath...
Applies to: SQL Server 2016 (13.x) and later Azure SQL Database Azure SQL Managed InstanceThere are three ways to create a system-versioned temporal table when considering how the history table is specified:Temporal table with an anonymous history table: you specify the schema of the curren...
When inserting new data in a table that is system-versioned, rows will be given the default enddate “9999-12-31 23:59:59” upon insertion, this will allow the server to maintain the data and always have the current dataset in the table at all times. Basically means that the record is...
自SQL Server 2008 (10.0.x) 起,锁升级的行为已更改,其中引入了 LOCK_ESCALATION 表选项。 有关详细信息,请参阅 ALTER TABLE 的LOCK_ESCALATION 选项。 监视锁升级 使用lock_escalation 扩展事件来监视锁升级,如以下示例中所示: SQL 复制 -- Session creates a histogram of the number of lock es...
For more information, see Query data in a system-versioned temporal table.Point-in-time analysis (time travel)Instead of focusing on changes to individual records, time travel scenarios show how entire data sets change over time. Sometimes time travel includes several related temporal tables, each...