Remove duplicate values

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Remove duplicate values

i am trying to insert values into database from excel spreadsheet .am doing it using JDBC.connected both excel and sql database. i have these columns dc:Title,dc:dcid,dc:subject,dc:description,dc:publisher,dc:language in SQL database. in which dc:title will not allow null and dc:dcid is primary key. other attributes can allow null. am trying to insert values from spreadsheet having 4 rows.

    statement2.executeUpdate("insert into dbo.Text([dc:Title],[dc:Description],[dc:Publisher],"
      + "[dc:language],[dc:subject],[CreatedBy])"
      + " values('"+Cname[i]+"','"+textdescription[i]+"','"+publisher[i]+"','"
      +language[i]+"','"+Subject[i]+"','"+Createdby[i]+"')");

after each running of the program the above query inserts those 4 rows repeatedly. i want to have unique values means values shouldn't be repeat in the database.

q1. how can i eliminate duplicate values during insertion? please i need code snippet.

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