如何确定 sql table 是否为 Temporal？

Question

SQL Server 2016 支持 Temporal Tables 我想知道是否有办法确定 table 当前是否是临时的？像

select * from sys.objects where object_id('dbo.MyTable', 'u') = parent_object_id and type_desc = "SYSTEM_VERSIONED"

Answer 1

SELECT temporal_type
FROM   sys.tables
WHERE  object_id = OBJECT_ID('dbo.MyTable', 'u') 
0 = NON_TEMPORAL_TABLE

1 = HISTORY_TABLE

2 = SYSTEM_VERSIONED_TEMPORAL_TABLE

Documentation

Answer 2

本 SQL 教程中给出了另一种将临时表及其历史表一起列出的方法 List Temporal and History Tables in a SQL Server Database

select
 t.object_id,
 t.name,
 t.temporal_type,
 t.temporal_type_desc,
 h.object_id,
 h.name,
 h.temporal_type,
 h.temporal_type_desc
from sys.tables t
inner join sys.tables h on t.history_table_id = h.object_id

Answer 3

此查询将为您提供系统版本表、关联的历史表、保留策略以及是否在数据库级别启用保留策略。

From Microsoft Docs

SELECT DB.is_temporal_history_retention_enabled,
SCHEMA_NAME(T1.schema_id) AS TemporalTableSchema,
T1.name as TemporalTableName,  SCHEMA_NAME(T2.schema_id) AS HistoryTableSchema,
T2.name as HistoryTableName,T1.history_retention_period,
T1.history_retention_period_unit_desc
FROM sys.tables T1  
OUTER APPLY (select is_temporal_history_retention_enabled from sys.databases
where name = DB_NAME()) AS DB
LEFT JOIN sys.tables T2   
ON T1.history_table_id = T2.object_id WHERE T1.temporal_type = 2

Answer 4

这里简单回答一下原来的基本问题：

SELECT *
FROM sys.tables
WHERE name = 'MyTable'
    AND schema_id = SCHEMA_ID('dbo')
    AND temporal_type_desc = 'SYSTEM_VERSIONED_TEMPORAL_TABLE'

这是一个类似的查询，用于查找实际的系统管理历史记录 table:

SELECT h.* FROM sys.tables p 
INNER JOIN sys.tables h
    ON p.history_table_id = h.object_id
WHERE p.name = 'MyTable'
    AND p.schema_id = SCHEMA_ID('dbo')
    AND p.temporal_type_desc = 'SYSTEM_VERSIONED_TEMPORAL_TABLE';

如何确定 sql table 是否为 Temporal？

How to determine if sql table is Temporal?

sql

sql-server

sql-server-2016