Duplicate entry ‘1’ for key ‘PRIMARY’
Error reason: primary key conflict, primary key value is unique
solution: the value of ‘primary’ primary key cannot be the same
Example:
1. View the table structure
2. View data
3. Add data, add id = 1, and an error will be reported, because ID is the primary key with uniqueness
Solution: if the value of ID is modified, the addition is successful
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