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?? ?? ?? (PBM)? ?? ?? ? ?? ????? SQLServer? ?? ??? ?? ?????. ??, ?? ? ??? ???? ?????? ??? ??? ????? ??? ???? ??? ?? ?? ??? ?????. ??? ??? ???? ???????. 1. ?? ??, ?? ?? ? ??? ?????. 2. ??? ??? ??? ????? ?? ??? ?????. 3. ??? ???? ??? ??????. ???? ?? ???? ?????? ?? ??, ?? ???, ?? ??? ? ?? ?? ?? ??? ?????. ??? ?? ?? ?? ?? ??? ?? ?? ??? ???? ??? ? ??? ????? PowerShell ????? ?? ?? ?? ? ?? ??? ? ? ????. ??? ???????
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phpmyadmin?? ??? ??? ???? ??
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SQL ??? MySQL ??????? ?? ?? ??? ??????
toimportansqlfileintoamysqldatabase, usethecommandlinewithmysql-uusername-pdatabase_name
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Oracle?? ?????? ??? ??? ??
adatabaselinkinoracleiscreatedtoaccessredatabaseobjectsbyinectionpathingnetworkdetailsandcredentials.2. ensurenetworkconnectivity, eleporenetworksconfiguration, atnsoreasyconnectString, andthecreatedatabaselinkprivilegepovereing.3
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MySQL?? JSON ???? ???? ??? ??????
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Navicat : ?? ??? ?? ?? ??? ??????
Navicat ??? ?????? ?? ?? ??? ??? ????. 1) ??? IP ?? ?? ??? ??, 2) ?? ??, 3) ??? ??, 4) ????. ??? ?? ??? ???? ???? ??? ????? ?? ??? ?? ? SSH ??? ???? ?? ??????.
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MySQL?? ???? ??? ???? ??
?? ?? ??? ??????. showcreatetable, showtablestatus ? showfullcolumns? ???? ??? ? ?? ?? ?? ? ?? ??? ??????. 2. ??? ? ? ?? ??? ?? : AltertableYour_table_nameConvertToCaracterSetUtf8MB4CollateUTF8MB4_unicode_ci? ???? ??? ?? ?? ??? ??? ???? ?? ?? ?? ???? ?????. 3. ??? ?? ?? ?? ? ?? : ?? ?? ???? ??? AltertableYour_table_namedeFaultCharacter? ??????.
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MySQL ??? ? ?? ???? ??? ??????
?? ?? ???? MySQL ???? ?? ? ? ?? ???? Orderby ? Offset? ?? ???? ???? ?? ? ? ????. ?? ??, selectfromuserslimit5? ?? 5 ?? ?????. selectfromuserslimit10offset10? ?? 10 ?? ?? ?? ?? 10 ?? ?????. ??*omployeeSOrderBysAlaryDesclimit3 ??? ??? ?? ?? 3 ?? ??? ????.
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MongoDB?? ?? ???? ???? ????? ??
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??? ??? MongoDB? ???? ??
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MySQL ??????? ?? ???? ?? ? ??? ?? ??? ??????
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SQL? ? ???? ??? ???? ?? ??? ??????
? ??? ??? ???? ???? Window ?? row_number (), 1. PartitionBy? ???? ??? ??? ???????. 2. ?? ??? Orderby? ???? DESC?? ?? ??? ???? ??? ???? ?? ??? ???? ??????. 3. row_number ()? ?? ? ? ??? ??? ??. 4. RN = 1 ? ?? ?, ? ? ??? ??? ??????. ? ??? ??? ?? ???????? ????? ??? ???? ?? ? ? ????.
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SQL?? ????? ??? ? ??? ???? ??? ??????
PessimisticLockingpreventsConflictsbyAcquiringLocksbeforedatamodification, usingsqlcommandSlikeselect ... forupdate, genteringexclusiveAccessuntilThransactionends, makingIdealforhigh-contentionscenarioSuchasfinancialsystems.2.optomisticlowlowingco
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??? ???? ?? MongoDB? ????? ??
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