Скачать или смотреть Solving the Incorrect Datetime Value Error with MySQL in SQL Server Linked Queries

Discover why you might encounter `Incorrect Datetime Value` errors when updating MySQL tables via SQL Server linked servers and learn how to fix it efficiently.
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This video is based on the question https://stackoverflow.com/q/62995233/ asked by the user 'jimbonda' ( https://stackoverflow.com/u/11851576/ ) and on the answer https://stackoverflow.com/a/62995322/ provided by the user 'GMB' ( https://stackoverflow.com/u/10676716/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the Problem of Incorrect Datetime Value in SQL Queries

When working with linked servers in SQL Server, many developers face challenges when trying to update data in MySQL databases—especially when dealing with datetime values. One common error is the infamous Incorrect Datetime Value message. This can be quite frustrating, particularly since it doesn't happen consistently. Let's dive into this problem and explore the solutions.

What Causes the Incorrect Datetime Value Error?

In the scenario we're discussing, a user attempts to update a TransferDate column in a MySQL database through a SQL Server linked server query:

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The error typically occurs when the datetime format sent from SQL Server includes milliseconds. MySQL's datetime type does not support milliseconds, resulting in an error when it encounters values like '2020-07-20 13:11:26.1133333'. Let's break down the solution options to avoid this issue.

Effective Solutions to Handle the Error

To successfully update the TransferDate in the MySQL database without hitting the incorrect datetime error, you can employ one of the following strategies:

1. Change the Column Type in MySQL

One straightforward solution is to adjust the datatype of the TransferDate column in your MySQL database. By changing it from datetime to timestamp, you allow for greater flexibility in handling datetime values. Here’s how to do that:

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This allows your column to handle datetime values more gracefully across platforms, including SQL Server.

2. Use SQL Server's convert() Function

If you prefer to keep the current datetime type in MySQL, you can leverage SQL Server's convert() function. This allows you to format the timestamp appropriately by removing milliseconds. Here's the modified query:

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In this solution, the convert(char(19), current_timestamp, 120) converts the current timestamp from SQL Server to a format compatible with MySQL’s datetime data type, discarding milliseconds and ensuring no Incorrect Datetime Value error occurs.

Conclusion

By understanding the limitations of MySQL's datetime type and employing either of the strategies highlighted above, you can effectively navigate the Incorrect Datetime Value error in your SQL queries. Whether you choose to modify the column type or format your timestamps correctly, you will be able to maintain smooth data transfers between SQL Server and MySQL.

Feel free to implement these solutions and share your experience or any further questions you might have in the comments below! If you found this blog helpful, you can also explore more articles on SQL and MySQL optimization techniques.