It means that the primary key of the data in ORACLE may be duplicated, or it may be due to the definition of your Mysql field, which causes implicit conversion of the data inserted into Mysql, resulting in duplication of the originally unique data. First check whether the data in the primary key column or unique index column inserted into the Mysql table in ORACLE is duplicated. If not, check whether there is a problem with the field definition in the Mysql table.
The questioner has inserted exactly the same data. (This may be the reason. I encountered this reason last time. It was exactly the same data when inserting, and even the unique ID was the same, so this error was reported).
To be simple and crude, just re-import the database.
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It means that the primary key of the data in ORACLE may be duplicated, or it may be due to the definition of your Mysql field, which causes implicit conversion of the data inserted into Mysql, resulting in duplication of the originally unique data. First check whether the data in the primary key column or unique index column inserted into the Mysql table in ORACLE is duplicated. If not, check whether there is a problem with the field definition in the Mysql table.
The questioner has inserted exactly the same data. (This may be the reason. I encountered this reason last time. It was exactly the same data when inserting, and even the unique ID was the same, so this error was reported).
To be simple and crude, just re-import the database.