Explain the function of static keyword and final keyword in Java in detail>>> 
DATA truncated FOR COLUMN ‘description’ AT ROW 1
1. Error reappearance
Null field in table
At this point, modify a field in the table as the primary key
2. Solutions
Null fields are not allowed in the database
Null fields are not allowed in the database
Null fields are not allowed in the database
3. Cause of the problem
This error is actually caused by the illegal inserted data
For example: garbled code, over field length, illegal characters, etc., the data inserted here is caused by over field length
At that time, the field description (description) of the table in MySQL database was varchar (32), and the number of inserted data was more than 32, so it can be modified to varchar (300)
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