MySQL ??? ????? ??? ??????
??? ???? ???? Where, Join, Orderby ? Groupby? ??? ?? ?? ??? ???? ?? ??? ?? ??? ????? ??? ???? ??? ??? ?? ??? ??? ??????. 2. ???? ??? ??, ??? ???, ?? ??? ??? ???? ??, ????? ??? ????, ?? ?? ??? ???? ????, ?? ????? ?? ??? ??????. 3. ?? ? ??? ?? ???, ?? ?? ????? ??? ????, ??? ?? ??? ????, ??? ??? ?? ???? ???????, ? ?? ??? ??? ???? ???? ??????. 4. ?? ? ?? format = json? ???? ?? ?? ??? ????,
Aug 15, 2025 am 09:02 AM
MySQL?? ????? ???? ??
MySQL ????? ???? ????? STARTTRANSACTION ?? ??? ?? ????? ?? ??? ???? ?? SQL ??? ??????????. ?? ??? ???? ?? ??, ??? ??? ?? ??? ??? ??????. SavePoint? ???? ?? ??? ???? ?? ?? ?? ??? ? ????. ????????? Try-Catch ????? ?? ??? ???????. ??? ?? ??? ??? ?? ?? ?? ??? ?? ??? ?? ???? ??? ????? ??? ???? ???? ???? ?? ???? ??? ?? ??? ?? ??? ??????.
Aug 15, 2025 am 08:31 AM
MySQL ?? ? ?????? ????? ???? ??
~/.my.cnfwithchmod600tosecurecelySeveceAdentAndenablePasswordLogin; 2.EnableAuto-RehashinConfigorcommandlinefortabcom? ?????? pletionofdatabases, ??? ? ??;
Aug 15, 2025 am 07:08 AM
MySQL?? ???? ??? ??
Locktables? ???? ???? ???? ?? ? ????. ?? ??? ?? ??? ?? ? ??? ? ?? ????. Write Lock? ?? ??? ?? ?? ?? ? ?? ??? ???? ?? ??? ?? ? ? ????. 2. ??? ?? ????? ????. STARTTRANSACTION ? ?? ??? ??? ?? ??? ??? ?????. ?? ? ?? ????? ??? ? ? ????. 3. MyISAM ??? ?? ?? ? ??? ??? ?? ?? ??????? ??????. InnoDB? ?? ??? ??? ?? Select ... ForupDate? ?? ???? ??? ?? ??? ???? ? ?? ??? ???????. 4. ??? ??? ? ?? ?? ???? ?? ??? ????????. ??? ??? ?? ??? ??? ? ????.
Aug 15, 2025 am 04:04 AM
MySQL?? ??? ??? ??? ??? ??????
tocopyonlythetableStructure? ???? indexesandconstraints, usecreatetablenew_tablelikeoriginal_table; primarykeysandauto-incrementsettingsbutwithoutdata.2.tocopybotheanddata, usecreatelew_teales
Aug 15, 2025 am 03:58 AM
MySQL?? WHERE ?? ???? ??? ??????
TheWhereClauseInMySqLisUsedTofilterRecordsBasedOnSpecifiedConditions, ??, ??, OrdELETION; itworkSwithStectect, Update, andDeletestAtementSyAmblitionSusingSusingSusingConparisonOperators = ,, =, LogicalOperatorsand ??, ?
Aug 15, 2025 am 03:56 AM
MySQL?? ???? ???? ???? ??
?? ??? ?? ????? ???? ? ?????. ?? ??? ????. 1. WHERE ??? ?? ??? ?? ???? ??? ???? ? ?? ??? ?????. 2. ?? ??? ? 1?? ???? ??? ? ????? (select1from ? 2? ??). ?? ??? ?? ? ?? ???? Select1 ?? ?? ? ? ?? ??? ?????. 3. ??? ????? ??? ?????.
Aug 15, 2025 am 03:04 AM
MySQL?? ?? ??? ???? ?? ??
tofindtableswithoutaprimarykeyinmysql, useeaqueryoninformation_schema; ??, ? ??, thenystemDatabaseSandViews, whenIdentifytablesNothaVingApRimaryKeyConstraintViakey_column_usageortable_constraints; 1.RuneprovidEctqueryFilteringsCyMaswortngnegnegningscymaspandenged
Aug 15, 2025 am 02:56 AM
MySQL ?? ??
MySQL ?? ??? ??? ??? ??? ??? ??? ?????. ???? ?? ?? ??? ??? ???????. ?? ??? ??? ??? ? ?? ?? ??? ???? ???? ???? ???? ??????. ???? ???? ?????? ?? ??, ??? ?? ?? ? ?? ?? ??? ?????. FT_MIN_WORD_LEN, ??? ?? ?? ??? ????? ?? ??? ???? ???? ???? ? ????. ?? ??? ????? ??? ? ??? ?? ? ???? ?? ?? ???? ?? ?? ?? ?? ?? ??? ??? ??? ???? ????. ?? ??, ??? ?? ???? ?? ??? ??, ??? ????? ?? ? ??? ??? ??? ?? ?????? ?????.
Aug 15, 2025 am 02:08 AM
MySQL?? ?? ??? ?? ??? ???? ??????
ThemainDifferensisthatinnerNoininCludeSonlySwithEnBothTables? whithEnbothTables? ??? ??? ??, withoutnon-matchingrowsfromoneorbothtables; ??, LeftJoineturnsAllrowssfromtheledtablatchedrowsfromtheright (withnullsforunmatched)
Aug 15, 2025 am 12:58 AM
MySQL????? ???? ??
MySQL????? ????? DropView ?? ??????. 1. ?? ??? dropviewview_name???. 2.??? ????? ???? ?? ??, ??? ??? ?? dropviewifexistsview_name? ??? ? ????. 3. dropviewifexistsview1, view2, view3? ?? ? ?? ?? ?? ? ?? ??? ? ????. ?? ??? ? ?? ? ???? ?? ??? ???? ??? ??? ??? ?? ? ? ?? ????? ?? ???? ????????. ??? ??? ??? ??? ? ??? ???? ?? ??? ??????.
Aug 14, 2025 pm 06:16 PM
MySQL?? Coalesce () ??? ???? ??? ??????
Coalesce () ReturnSefirstnon-NullValuefromalistofexpressions, MissingDatabySubStitingDefaults, MergingColumnValues, UphoptionalFields, ? ProvididingCalculations, ProvidaybacksinjoinsAndAggethations, ProvidingCalculations, ProvidingCalculations, ProvidedCleresuresuresuresuresuresul? ?????
Aug 14, 2025 pm 06:15 PM
MySQL? ??? ??? ???? ??????
UnionleMovesDuplicates? Duplicates; 1.unionperformsDeduplicationBysorting ? ComcomparingRows, ReturnOnlyUniqueresults, whathitSlowerOnlargedAtasets;
Aug 14, 2025 pm 05:25 PM
MySQL?? ??? ? ??? ??? ??? ???? ??? ??????
???? ???? ?? ?? ???? ???? ? ?????. Blob? ?? ???? ???? ???? ??? ???? ?????. ?? 4 ?? ??? ???? : ?? ??, ?? ? ?? ?? 4GB; 1. ?? ???? ?? Blob/Text? ????? Varchar? ?? ??? ????? ? ???????. 2. ??????? ??? ?? ???? ?? ?? ????. ?? ??? ???? ??? ?? ??? ?? ???? ????? ???? ?? ????. 3. Blob? ?? ?? ???? ???? JSON/XML? ?? ??? ???? ?? ?? ? ???? ???? ?? ???? ???????. 4. ?? ???/???? ????? ?? ????? CreateIndexIdx_contentonartic? ?? ??? ??? ?? ? ????.
Aug 14, 2025 pm 04:58 PM
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