DB2 SQL ERROR: SQLCODE=-803, SQLSTATE=23505, SQL

As soon as I came into contact with DB2, I encountered a problem. I felt that the explanation of DB2 error was not obvious. The novice was overwhelmed by the error information as follows

Error for batch element #1: DB2 SQL Error: SQLCODE=-803, SQLSTATE=23505, SQL

The reason is a violation of the uniqueness constraint…

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