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self_join (317B)


      1 # Self join
      2 
      3 A *self join* means reusing the same [database_relation] twice in [conjunctive_query]
      4 
      5 - for [enumeration], make lower bounds harder
      6 - for [pqe], makes upper bounds harder
      7 
      8 Up: [conjunctive_query], [join]
      9 
     10 See also: [sjfcq], [conjunctive_query_self_join_free]
     11 
     12 Aliases: self joins, self-join, self-joins