What does "com.mysql.jdbc.MysqlDataTruncation: Data truncation: Truncated incorrect DOUBLE value: 'q'" mean?

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This error message means that there is an attempt to insert or update a value of an incorrect data type into a MySQL database. Specifically, it is trying to insert a string value 'q' into a column that expects a numerical (DOUBLE) value. As a result, the database is truncating or cutting off the value and raising this error message to indicate the problem.