Help Center/ ROMA Connect/ 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 2022-02-21 GMT+08:00

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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

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