Help Center/ ROMA Connect/ User Guide (ME-Abu Dhabi Region)/ Troubleshooting/ Common Data Integration Tasks/ Error Message "Illegal mix of collations for operation 'UNION'" Is Displayed at the Source Database During MySQL-to-MySQL Data Integration

Updated on 2024-07-10 GMT+08:00

View PDF

Error Message "Illegal mix of collations for operation 'UNION'" Is Displayed at the Source Database During MySQL-to-MySQL Data Integration

Cause Analysis

According to the data source view at the source, union is used in the view definition statement. However, the encoding of the fields on both sides of union is inconsistent.

Solution

Use CONVERT to unify the encoding for fields, for example, CONVERT (ID USING utf8) AS ID.

Parent topic: Common Data Integration Tasks

Previous topic: Error Message "could only be written to 0 of the 1 minReplication nodes. There are 2 datanode(s) running and 2 node(s) are excluded in this operation" Is Reported at the Destination During Data Integration from MySQL to MRS Hive

Next topic: Data May Be Lost When Incremental Data Collection Is Performed from the Source MySQL on an Hourly Basis

Feedback

Was this page helpful?

Helpful Not helpful

Provide feedback

Thank you very much for your feedback. We will continue working to improve the documentation.See the reply and handling status in My Cloud VOC.

The system is busy. Please try again later.

Which of the following issues have you encountered?

Content is inconsistent with the product UI

Unclear descriptions

Lack of examples or code

Incorrect steps

Can't find what I need

Lack of best practices

Feedback (optional)

0/500

Select at least one type of issue, and enter your comments or suggestions.

Enter a maximum of 500 characters.

Submit Cancel

For any further questions, feel free to contact us through the chatbot.