IC90024:OPTIMIZERMIGHTFAVOURHSJOINOVERANORDEREDNLJOINTheoptimizermightfavourahashjoin(HSJOIN)overanestedloopjoin(NLJOIN)alternativeunderthefollowingconditions:-thejoinisontwoormorecolumns-bothtablesinthejoinhaveanindexwithleading,non-boundkeycolumnsthatpart..
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2015-04-28 02:05:51
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