_seq.nextval from dual

hi!

can anyone explain the following second sql statement?


      private PreparedStatement selectSequencePs;      
      
      private String selectSequence = "select assess_test_id_seq.nextval from dual";

thanks,
dkim18Asked:
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Helena MarkováConnect With a Mentor programmer-analystCommented:
It is a sequence. It is used for generating values. Here you can read all about it (the registration is free):
http://www.oracle.com/pls/tahiti/tahiti.tabbed?section=74579
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