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MySQL?? ?? ??? ?? ??? ??????

locktableStreventsDatainconsistenciesinnon-transactionalEngineslikemyisambyserializingAccess; 2.itallowscontroloverConcurrencyUsingReadlocks (??, forreadingonly) ? Writelocks (??);

MySQL?? ???? ??? ???? ??? ??????

TheGroupByClauseInmySqlisUsedTogRouProwSwithidenticalValuesInspecifiedColumns, enablingSummaryCalculationsWithAgateFunctionSlikeCount (), sum (), avg () ? Min (); forexailor, "selectregion,"astotal_salesfromsfromsfromsefromsalesgroupby "

MySQL?? ???? ???? ???? ??

MySQL?? ???? ??? ???? ????? UTF8MB4 ?? ??? ???????. 1. ??????, ??? ? ?? UTF8MB4 ? UTF8MB4_UNICODE_CI? ????? ??????. 2. MySQL ?? ???? ????? ? ?? ??? UTF8MB4? ???? innodb_large_prefix? ??????. 3. ??? ?? ? ? charset? UTF8MB4? ??????. 4. ShowVaribles ? ShowCreatetable? ?? ??? ??????. 5. UTF8MB4 ??? ?? ?????? ???? ??? ? ??? 191 ? ??? ??????. ?? ??? ???? UTF8M ? ??????

InnoDB? ?? ? ? ??? ????? MyISAM??? ???? ????. 2. InnoDB? ??? ??? ????? ?? ?? ?? ?? ??? ???? ??, MyISAM? ??? ?? ?? ??? ???? ?? ??? ?????. 3. InnoDB? ??? ???? ???? ?? ??? ?? ?? ??? ????? MyISAM??? ???? ????. 4. InnoDB? ?? ?? ??? ??? ??? MyISAM? ??? ??? ???? ????. 5. Myisam? ??? ?? ?????? ? ?? ? ??? Innodb? ?? ???? ? ? ?????. 6. MySQL5.6 ??, InnoDB? ?? ??? ???? ????? ? ?? ???? ?????. 7. InnoDB? ?? ?? ?? ??? ???? ????? MyISAM? ??? ? ?????. ????, InnoDB? ???? ?? ?? ????? ????

mysqldump? ???? ??????? ?? ?? ??

mysqldumpisusedtoexport, Notimport, Adatabase; toimport, usethemysqlcommand-lineclient.1.ensureyouhavea.sqldumpfilecreatedviam ysqldump.2.2

MySQL?? ?? ??? ???? ??????

Full-TextearchInmysqlenAbleSefficiver, ??? ?? XTSearchingInCharacter ?? ColumnSusingFullTextIndexSandMatch () ... () ??, ???? ?????, ??, ? QueryExpansionModesprimallyonnodbandmyisAmengines, MakingIdealForlar

MySQL?? ?? ??? ??? ???? ??

?? ??? ??? ????? ?? ?? ??? ??? ??????.? ???? ???? altertable? ??? ? ?? ? ? ????. 2. match () ...? ?? () ??? ???? ??? ???? ??? ??, ?? ?? ? ?? ??? ?????. 3. ?? ?? ??, ?? ??, InnoDB? MyISAM? ??? ?? ?? ? ?? ?????? ??????. 4. ??? ???? ??? ???? ??? ??? ??? ???? ????? ???? ?? MySQL ?? ??? ??? ???? ?? ???? ????? ??? ???? ? ????.

MySQL ??? ????? ??? ??????

??? ???? ???? Where, Join, Orderby ? Groupby? ??? ?? ?? ??? ???? ?? ??? ?? ??? ????? ??? ???? ??? ??? ?? ??? ??? ??????. 2. ???? ??? ??, ??? ???, ?? ??? ??? ???? ??, ????? ??? ????, ?? ?? ??? ???? ????, ?? ????? ?? ??? ??????. 3. ?? ? ??? ?? ???, ?? ?? ????? ??? ????, ??? ?? ??? ????, ??? ??? ?? ???? ???????, ? ?? ??? ??? ???? ???? ??????. 4. ?? ? ?? format = json? ???? ?? ?? ??? ????,

MySQL?? ????? ???? ??

MySQL ????? ???? ????? STARTTRANSACTION ?? ??? ?? ????? ?? ??? ???? ?? SQL ??? ??????????. ?? ??? ???? ?? ??, ??? ??? ?? ??? ??? ??????. SavePoint? ???? ?? ??? ???? ?? ?? ?? ??? ? ????. ????????? Try-Catch ????? ?? ??? ???????. ??? ?? ??? ??? ?? ?? ?? ??? ?? ??? ?? ???? ??? ????? ??? ???? ???? ???? ?? ???? ??? ?? ??? ?? ??? ??????.

MySQL ?? ? ?????? ????? ???? ??

~/.my.cnfwithchmod600tosecurecelySeveceAdentAndenablePasswordLogin; 2.EnableAuto-RehashinConfigorcommandlinefortabcom? ?????? pletionofdatabases, ??? ? ??;

MySQL?? ???? ??? ??

Locktables? ???? ???? ???? ?? ? ????. ?? ??? ?? ??? ?? ? ??? ? ?? ????. Write Lock? ?? ??? ?? ?? ?? ? ?? ??? ???? ?? ??? ?? ? ? ????. 2. ??? ?? ????? ????. STARTTRANSACTION ? ?? ??? ??? ?? ??? ??? ?????. ?? ? ?? ????? ??? ? ? ????. 3. MyISAM ??? ?? ?? ? ??? ??? ?? ?? ??????? ??????. InnoDB? ?? ??? ??? ?? Select ... ForupDate? ?? ???? ??? ?? ??? ???? ? ?? ??? ???????. 4. ??? ??? ? ?? ?? ???? ?? ??? ????????. ??? ??? ?? ??? ??? ? ????.

MySQL?? ??? ??? ??? ??? ??????

tocopyonlythetableStructure? ???? indexesandconstraints, usecreatetablenew_tablelikeoriginal_table; primarykeysandauto-incrementsettingsbutwithoutdata.2.tocopybotheanddata, usecreatelew_teales

MySQL?? WHERE ?? ???? ??? ??????

TheWhereClauseInMySqLisUsedTofilterRecordsBasedOnSpecifiedConditions, ??, ??, OrdELETION; itworkSwithStectect, Update, andDeletestAtementSyAmblitionSusingSusingSusingConparisonOperators = ,, =, LogicalOperatorsand ??, ?

MySQL?? ???? ???? ???? ??

?? ??? ?? ????? ???? ? ?????. ?? ??? ????. 1. WHERE ??? ?? ??? ?? ???? ??? ???? ? ?? ??? ?????. 2. ?? ??? ? 1?? ???? ??? ? ????? (select1from ? 2? ??). ?? ??? ?? ? ?? ???? Select1 ?? ?? ? ? ?? ??? ?????. 3. ??? ????? ??? ?????.