Add the row insertion time to a MySQL table

This article is a part of my "100 data engineering tutorials in 100 days" challenge. (92/100)

It is a good practice to track when the data was inserted into a database or modified. However, relying on the backend applications to set that information correctly is error-prone. That’s why we can configure a MySQL table to automatically use the current timestamp as the default value and store that time as the row creation time.

We have to do that when the table is created (or alter an existing table):

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create table table_name (
    ...
    created_ts   timestamp default current_timestamp
);

Similarly, we can track the table update time. In this case, we have to use the on update clause:

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updated_ts   timestamp default current_timestamp on update current_timestamp

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Bartosz Mikulski
Bartosz Mikulski * MLOps Engineer / data engineer * conference speaker * co-founder of Software Craft Poznan & Poznan Scala User Group

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