MySQL?? ?? ??? ?? ? ????? ???? ??
??? ???? ???? ????? UTF8MB4 ?? ??? ???? ?? ??? ??? ???? ??? ???????. 1. ?? ?? ? ?? ?? ?? : UTF8MB4? ?? ?? ?? ??? ?????. UTF8MB4_UNICODE_CI? ???? ??? ??? ??? ???? UTF8MB4_BIN? ?? ??? ??? ?????. 2. ?? ?? ?? setGlobal? ?? ?? ???? ?? ?? ?? ? ?? ??? ?????. 3. ??????? ??? ? ?? setutf8mb4 ? collateUtf8mb4_unicode_ci? ????? AlterDatabase? ??????. 4. ?? ??? ??? ?? ? ???? ?? ? ?? ????.
Sep 07, 2025 am 03:17 AM
Python? ???? MySQL ??? ???? ??
Python? ???? MySQL ??? ????? ?? MySQL-Connector-Python ?? PymySQL ?????? ?? ? ?? ??? ?? ??? ???? ??? ???????. 1. ????? ?? : pipinstallmysql-connector-python ?? pipinstallpymysql? ??????. 2. mysql-connector-python ?? ?? : mysql.connector.connect () ???? ?? ???, ??, ???, ???? ? ?????? ?? ??? ???? try-except ??? ??? ??????. ??? ??? ?? ??????.
Sep 07, 2025 am 01:09 AM
MySQL? ????? ???? ???? ??
MySQL ????? ???? ????? ?? ???? ???????? ???????. 1. ?? ??? ?? ??? _namewhere ?????. ?? ??? ????? WHER ?? ????????. ??? ??? DeleteFromUserswhereID = 5? ?? ?? ?? ?????. ID 5??? ???? ?????. 2. Deletefromuserswhereage? ?? ? ?? ??? ?? ?? ?? ??? ? ????.
Sep 07, 2025 am 01:00 AM
MySQL ?? ? ?????? ??? ???? ??
\ gtodisplayResultsVerticallyforBetTerReadabilityFwiderows, ?? widenviewingsinglerecordswithManyColumns; 2.use-tableor- ververicalcommand-lineOptionStoforcedeFaultTableOroutPutateThinstArtingTheClient;
Sep 06, 2025 am 07:24 AM
MySQL?? ???? ??? ???
MySQL ???? ???? CreateUser ??? ? ??? ??? ??????. 1. createUser'UserName '@'host'IndifiedBy'Password '? ???? ???? ????. 'John'@'localhost'?? 'Anna'@'%'? ??. 2. grantallprivilegesondatabase_name.*to'user'@'host '? ?? ??? ?? ??? ??? ?????. ?? GrantSelect. 3. Flush -Privileges? ??????. ??? ??????. 4. ??? ??? ???? ?? ??? ??? ??? ??? ?? ???? ?? ????.
Sep 06, 2025 am 06:53 AM
MySQL ?? ???? ??? ???? ??
DeclareVariblesSuredDeclareatStartOfAblockwithDatatypeslikeInt, varchar ? ? OptionAldEfaultValues.2. AssignValuesSetForexPressionSERLECT ... intoforQueryResults, 3.useverRehEryResults.3
Sep 06, 2025 am 06:42 AM
MySQL?? ?? ??? ??? ??? ???? ??????
LeftJoin? ?? ???? ?? ?? ???? ??? Join? ??? ???? ?? ?? ?????. ??? ??? ???? ? ??? ?? ?? ? ? ????. ?? ??, selectu.name, o.amountfromuserssurightjoinordersoonu.id = o.user_id? selectu.name, o.amountfromorderSoleftJoinUserssuonu.id = o.user_id? ?????. ??? ???? LeftJoin? ? ????? ?? ???? RightJoin? ???? ??? ??? ? ??? ???????.
Sep 06, 2025 am 05:54 AM
MySQL?? ?? ??? ???? ??
themax () functionBehesturnstheHighestValueInaspeCifiedColumn.2.itcanBeusedwithNumericData, ??, orstrings, returningThelatestDateOralPhabeticallyLastString.3.useMax () WithwheretOfilterrowsbeforefindingTheMaximums.4.usemax ()? ?? witheretofilterrowsbeforefindingthemax.4.usemax
Sep 06, 2025 am 04:47 AM
MySQL? ?? ?? ?? ??????
acompositeprimarykeyinmysqlusesmultiplecolumnstountounstouniqueLiedificaRow, suchas (withy_id, course_id) inanenrollmentStable, whereThecombinationEsuresuniquenessBecausenecanecan; thisnorcesnullcanstrantontsonbothcolumns, ??
Sep 06, 2025 am 03:03 AM
MySQL?? ??? ??? ???? ??
??? ?? ???? SQL ??? ????? ???? ??? ???? ? ????. ?? ???? ???? ?? ??? ???? ?? SQL ??? ???? ???? ????. 1. MySQL ?? ????, ??, ??, ?? ? ??? ???? repayestmt_namect*fromusershowsid =? '? ?? ??? ??? ???? ?????. 2. PHP? MySQLI?? repary ()? ???? inde_param ()? ???? ?? ??? ????? ()? ???? ???? ????? ?? ????. 3. PHP? PDO?? ??? ?? ?? ?? ?? ???? ?????.
Sep 05, 2025 am 08:04 AM
MySQL?? ?? ???? ????? ??? ???? ??
useIndExSuggestSanIndexButallowsmysqltoIgnoreItifatablescanisbetter; 2.forceIndexRequirestHeOfScificIndExandPreventStablescans, timizerMakesPoorCoicesButmayDegradeperFormanceIfMissed;
Sep 05, 2025 am 06:53 AM
MySQL?? ???? ? ??? ?? ??
MySQL ???? ? ??? ???? ? ?? ??? ????. 1. SELTETALE_NAME ?? ?? ??? ??? ?? ?? ??? ??? ??? ??????. 2. showcolumnsfromtable_name? ???? ????? ????? ??? ?????? ? ? ?? ???? ?????. 3. ?? _schema.columns ???? ??????.? ???? ??? ? ??? ???? ?? ?? ??-?? ?? ? ???? ?????? ??? ? ????. ?? ????? ?? ??? ??? ??????.
Sep 05, 2025 am 04:47 AM
WHERE ?? ?? ? ??? ???? ??????
truncateisfasterand moreefficientsdataureclausedeallocatesdatapages ? minimallylogstheoperation, whiletelogseachrowdeletion indiversity, mateitslower; truncateresetsidentitycounters, dopyretiggers, and mayberestrictedbyfore ???
Sep 05, 2025 am 04:35 AM
MySQL?? ???? ????? ???? ??
formysql5.7.6andlater, usealteruser'username '@'host'Identifiedby'new_password '; 2. forolderversions, useetpasswordfor'username'@'host'= password ( 'new_password'); 3.tochangeyourownpassword, usealuseruser () willifiedsifiedby_password ';
Sep 05, 2025 am 04:29 AM
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