Solution of duplicate entry ‘value’ for key ‘field name’ in MySQL

I. Problems:

II. Question interpretation:
Duplicate entry… for key… This error is caused by the repetition of the unique value of the primary key. This error will be reported when the unique value of the primary key is repeated during database modification or insert operation. Sometimes, this error will be reported for table operations when there are multiple identical primary keys.
(p) If you want to import data from one table into another table, you will get an error in using the primary key field.
Three, solutions:

First, if the primary key is not a required field, the primary key is not used

The second way is to remove the duplicate from the table and start the operation

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