INF: ?????? ????? ???? ????? ??????? ?????? ???????

?????? ????????? ?????? ?????????
???? ???????: 169642 - ??? ???????? ???? ????? ????? ??? ???????.
??? ????? ??? ???????. ????? "??? ??" ??? ??? ??????? ??? ????.
????? ???? | ?? ????

??????

?? ????? ???? ????? ????? ??? ??????? ? ???? SQL Server ??????? ????? ?? ?????????. ????? ???????? ???????? ?? ???? WHERE ??????? ????? ?????? ??? ?????? ?????? ??????? ???? ??? ??????? ?? ??? ?????????. ??? ??? ??????? ?? ???????? ?? ???? WHERE ?? ??????? "???? ???? ???? ???????". ?? ???? ???? ????? ??? ??? ??????? ?????? SQL Server ???? ????? selectivity ?????? ?????? ???????? ??? ??? ??? ??? ????????.

?? ??????? ?? ????? ?????? ????? selectivity ??????? ???????? ??? ??????? ??????? ?????? ?? ???? ???????. ????? ?????? ???? ?????? selectivity ???? ?????? ??? ???????? densities ???? "?" ??????? ???????. ????? ??????? ?? ????? selectivity ????? ????? ???? ???? ????????? ????? ?? ???? ??????? ????? ?? ???????? ?????? ???????. ??? ????? 10 ??????? ????? ?????? ??? ?????? ????????? 25 ??????? ?????? ??? ??? ???????? ? ??????? 33 ?????? ??? ???? ?? > ?????? ???? ?? ?? ???? ?? ?? ????? ???? ?? ?? ????? ?????????.

??????? ????

????? ?????? ???? ?? ????? ????? ????? ???? ????? ????? ?? ???? WHERE. ??? ???????? ??????? ??????? ??? ?? ??? ?????? ????? ?? ?????? ??????. ????? ??? ???? ?????? "???? ???? ???? ???????". ???? ??????? ???? ??????? ??? ???? ?? ?????? ??????. ?? ???????? ????? ??? ????? ???? ?????? ??? ?????????.

?????? ?????? ????? ????? ?????? ?????? ??? ????? ?????? ????? ?? ???? ?????? ??????? ??????? ??? ??????? ?????:
  1. ???? ????? inequality (??? ?? ??????! = ????). ??? ??? ????? ????? ??? ? ?? ???? ?????? ?????? ????? ?????? ?? ??? ?????? ?? ????.

  2. ????? ???? ???? ??????? ????????? ??????? (??? ?? ?????? = ??????? ?????? @) ? ?? ?? ???? ????? ???? ??????? ?????? @ ??? ??? ???????. ???? ??? ???? ??????? ?????? @ ??? ????? ?? ??? ??????? ???????. ?? ???? ??? ??? ?????? ???????? densities ??????? ?? ????? ??????. ?? ???? ??? ???? ?????? ?? ???? ????? ????? ????? ??????? ???????. ???? ??????? ??????? ?????? ?????? ??? ???? ??? ?? ?????? ?????? ????? ????.
  3. ???? ???? ????? ??? ?????? ?? ???? (??? ?? ???? * 100 = ????). ?? ??? ?????? ??? ?????? ??? ?????. ????? ?? ???? ???? rewriting ??????? ??? (??? ?? ?????? ??????? = ????/100).
  4. ??????? ??? ??????????? ??????? ".. ???? ??????? ?????? .where (??? ???? ?? ????)" ?? ?? ???? ?????? ?????? ??? ??????? ??????? ??????? ??? ???? ????? ???? ??? ????? ??? ??? ????? ?????????.
  5. ?? ???? ??????? ???? ????? ?? ?????? ??? (???? ?????? ???).
????? ?? ???????? ??? ????? ????????? ????? ???? ???????? ??????? ?? "????? ????? Microsoft:
110352: INF: ?????? ?????? ???? Microsoft SQL

46434: INF: ??????? ????????? ????? ? ????????? ????????

???????

???? ???????: 169642 - ????? ??? ??????: 30/???? ?????/1435 - ??????: 3.0
????? ???
  • Microsoft SQL Server 6.0 Standard Edition
  • Microsoft SQL Server 6.5 Standard Edition
????? ??????: 
kbnosurvey kbarchive kbmt kbinfo kbusage KB169642 KbMtar
????? ????
???: ??? ????? ??? ?????? ???????? ?????? ????? ???? ????? ?????????? ????? ?? ????????? ?????? ????. ???? ???? ?????????? ???? ?? ???????? ???????? ?????? ????????? ????? ????????? ???????? ????? ???????? ?????? ?? ?????? ??? ?? ???????? ???????? ?? ????? ??????? ?????? ??? ??????? ?????? ??. ?????? ?? ???? ??? ??????? ???????? ????? ?? ???? ????? ?????? ??? ????? ??? ????? ??????? ?? ????? ?? ?????? ??? ??? ??????? ??????? ?? ????? ????? ????? ????? ?????. ?? ????? ???? ?????????? ??????? ??? ????? ?? ??????? ?? ????? ?????? ?? ??? ????? ?? ????? ??????? ?? ???????? ?? ??? ???????. ???? ???? ?????????? ???????? ??? ????? ?????? ??????? ??????
???? ??? ????? ??????? ?????? ??????????169642

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