Home/ Questions/Q 7679041
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-31T17:47:06+00:00

I am mainly from a Sql Server background, and following some issues with getting

  • 0

I am mainly from a Sql Server background, and following some issues with getting MySql to work with the Microsoft Sync Framework (namely it does not cater for snapshots), I am having to look into Postgres and try to get that working with the Sync Framework.

The triggers that are needed include a call to function “@@DBTS”, but I am having trouble finding an equivalent in Postgres for this.

From the microsoft documentation for this it says:

@@DBTS returns the current database's last-used timestamp value. 
A new timestamp value is generated when a row with a timestamp 
column is inserted or updated.

In MySql it was the following:

USE INFORMATION_SCHEMA;
SELECT MAX(UPDATE_TIME) FROM TABLES WHERE UPDATE_TIME < NOW();

Can anyone tell me what this would be in Postgres?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    PostgreSQL does not keep track when a table was last modified. So there is no equivalent for SQL Server’s @@DBTS nor for MySQL’s INFORMATION_SCHEMA.TABLES.UPDATE_TIME.

    You also might be interested in this discussion:

    http://archives.postgresql.org/pgsql-general/2009-02/msg01171.php

    which essentially says: “if you need to know when a table was last modified, you have to add a timestamp column to each table that records that last time the row was updated“.

    • 0