Sql update command for updating date along with timestamp
In this article, I describe a few ways you can leverage Microsoft Access date functions in your Access 2007 and Access 2010 databases.If you have never used Microsoft Access date functions, take a look at this quick Beginner's Guide to Microsoft Access Built-in Date Functions that I recently created and shared on our Office You Tube channel.There are a few ways to have Access insert today's date, but the simplest way is add a simple Date() function to the Default Value property of your table.Let's say we have a database that tracks applicants and case workers, and when cases are assigned, signed out, and closed.Don’t rely on properly formed queries to populate these columns! CREATE TABLE orders( id INT NOT NULL AUTO_INCREMENT, user_id INT NULL, amount FLOAT NULL, updated_at TIMESTAMP NOT NULL DEFAULT NOW() ON UPDATE NOW(), created_at TIMESTAMP NOT NULL, PRIMARY KEY(id)); Query OK, 0 rows affected (0.00 sec)So now your table has been created.The important part is the “updated_at TIMESTAMP NOT NULL DEFAULT NOW() ON UPDATE NOW()”This ensures that when new rows are added, the default value is NOW() and then it updates again on every update to that row.
Only the ISO format with a space inbetween works for updates, but not for the table which had a datetime field as primary key. It should work for everybody regardess of locale or collation settings.Another benefit you get from having an updated_at column is efficient data replication into systems like Pipeline, one of our products at RJMetrics.If we know which rows have been updated recently, we can sort by that column and prevent redundant queries. Here’s how to make an automatically updating created_at timestamp in My SQL 5.5.The reason your updates are not working, Ansgar, is not due to errors with Heidi or ISO format.Microsoft Access date functions are a powerful way to retrieve and analyze data in your Access databases, but very few users know about these functions or how to use them.
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Database triggers are a handy way to monitor database activity and to efficiently perform some maintenance tasks.