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PUBLIC MARKS from recommend with tags filesort & joins

recommend's TAGS related to tag filesort

basic +   case +   column +   columns +   current +   explain +   extra +   find +   index +   indexes +   indexing +   join +   joins +   keys +   li +   matching +   matter +   mysql +   null +   output +   part +   primary +   principle +   query +   real +   result +   rows +   secn +   simple +   table +   tables +   tbla +   tblb +   tblc +   tbld +   temporary +   time +   type +   values +