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PUBLIC MARKS from recommend with tags principle & index

recommend's TAGS related to tag principle

assert +   authoritative +   basic +   case +   code +   column +   columns +   current +   doesn +   domain +   duplicate +   duplication +   error +   explain +   extra +   filesort +   find +   floating +   function +   implementation +   index +   indexes +   indexing +   integer +   interface +   Irrational +   join +   joins +   keys +   knowledge +   li +   matching +   matter +   mysql +   null +   number +   onceandonlyonce +   output +   part +   point +   pr +   primary +   query +   real +   representation +   requirement +   result +   root +   rows +   secn +   simple +   single +   source +   sqrt +   square +   system +   table +   tables +   tbla +   tblb +   tblc +   tbld +   temporary +   test +   time +   type +   values +