17.10 - Example: Nonsequenced Query on a Transaction-Time Table - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - Temporal Table Support

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1182-171K
Language
English (United States)

To query a transaction-time table such that no special semantics are placed on the transaction-time column, use the NONSEQUENCED TRANSACTIONTIME temporal qualifier in the SELECT statement. For example:

   NONSEQUENCED TRANSACTIONTIME SELECT * FROM Policy_Types;

Policy_Name          Policy_Type  Policy_Duration
-------------------  -----------  ----------------------------------------------------------------------
Premium Automobile   AP          ('2012-06-19 20:04:18.470000-07:00', '9999-12-31 23:59:59.999999+00:00')
Basic Homeowner      HM          ('2012-06-19 20:04:32.410000-07:00', '9999-12-31 23:59:59.999999+00:00')
Business             B           ('2012-06-19 20:04:32.680000-07:00', '9999-12-31 23:59:59.999999+00:00')
Basic Automobile     AU          ('2012-06-19 20:04:32.470000-07:00', '9999-12-31 23:59:59.999999+00:00')
Major Medical        M           ('2012-06-19 20:04:32.550000-07:00', '2012-06-19 20:19:54.100000-07:00')
Premium Homeowner    HP          ('2012-06-19 20:04:32.610000-07:00', '9999-12-31 23:59:59.999999+00:00')

Notice that the Major Medical policy type is a closed row. It shows an end transaction time prior to 9999-12-31. This indicates that the row was logically deleted from the table at the ending transaction time, on 2012-06-19. However, because the row is in a table with a transaction-time dimension, the physical row persists in the table as a closed row.