How to Convert Date Format in SQL Server from dd/mm/yyyy to yyyy-MM-dd скачать в хорошем качестве

How to Convert Date Format in SQL Server from dd/mm/yyyy to yyyy-MM-dd

Learn how to effectively convert date formats in SQL Server, specifically from `dd/mm/yyyy` to `yyyy-MM-dd`, and avoid common errors in the process. --- This video is based on the question https://stackoverflow.com/q/68726107/ asked by the user 'jacobdavid' ( https://stackoverflow.com/u/7859156/ ) and on the answer https://stackoverflow.com/a/68726192/ provided by the user 'Gordon Linoff' ( https://stackoverflow.com/u/1144035/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Converting date format of column Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- Understanding Date Format Conversion in SQL Server Working with dates in SQL Server can sometimes be tricky, especially when dealing with different formats. If you have a column that stores dates in the dd/mm/yyyy format but require the data to be displayed in the yyyy-MM-dd format, you may encounter errors and unexpected results. In this guide, we’ll discuss how to effectively convert date formats in SQL Server and provide solutions for common issues you might face, like the conversion failure error. The Problem You are trying to modify the date format of a column containing values in the dd/mm/yyyy format to yyyy-MM-dd, and after executing your SQL query, you encounter an error message: [[See Video to Reveal this Text or Code Snippet]] This indicates that SQL Server is struggling to interpret the string as a valid date. So, what can you do to resolve this issue? Solutions to Date Format Conversion There are multiple scenarios regarding how the date data is stored in your SQL Server table, which will determine the conversion method you should use. 1. When the Date is Stored as a String If your date is stored as a string in your database, you need to convert it from the existing format. Here’s how you can do that: [[See Video to Reveal this Text or Code Snippet]] convert(date, datecol, 103): This command attempts to convert a string in the dd/mm/yyyy format into a date type. 2. When the Column is Already a Date If the column is already a date type but displays in a way that is not desired, your SQL Server settings might be at play. In such cases, you can create a computed column with your preferred format: [[See Video to Reveal this Text or Code Snippet]] CONVERT(varchar(10), datecol, 120): This will format the date as yyyy-MM-dd. 3. Dealing with Invalid Dates Before converting the column, it is good practice to ensure that all data in the column is valid. To identify invalid date values, you can run: [[See Video to Reveal this Text or Code Snippet]] TRY_CONVERT: This function attempts the conversion and returns NULL if it fails, allowing you to spot problematic entries. 4. Final Update and Data Type Change Once you’ve ensured that the data entries are correct, you can then convert and update the original values: [[See Video to Reveal this Text or Code Snippet]] After the update is complete, it is advisable to change the column type to a date for future operations: [[See Video to Reveal this Text or Code Snippet]] Conclusion Converting date formats in SQL Server can be straightforward with the right approach. By following the solutions provided and ensuring data validity, you can efficiently convert your date formats from dd/mm/yyyy to yyyy-MM-dd. Avoiding common pitfalls and utilizing SQL Server’s functions will enhance your data management tasks. If you face any challenges or have additional questions about SQL date formats, feel free to leave a comment below!