MySQL?? ???? ???? ??
MySQL ??? ??? ????? ?? ?? DESC ??? ??? ? ????. 1. delipetable_name ?? desctable_name? ???? ?? ??, ??? ??, null, ? ??, ??? ? ?? ??? ??????????. 2. ShowCreateAbletable_name? ???? ?? ?, ?? ?, ???? ?? ? ?? ??? ?? ? ??? ??? ?? ?? ?????. 3. information_schema.columns ???? ????? ? ??, ?? ?? ?? ?? ?? ???? ?? ??? ??? ?? ??? ? ??? ???? ?? ??? ?? ??? ???? ??????.
Aug 11, 2025 pm 07:05 PM
MySQL? ?????? ??? ???? ??
ToreVokePrivilegesfromauserinmysql, UsethereVokestatement; 1. SpecifyThePrivileGetype (? : ??, ??, allprivileges); 2.define thescopeusingdatabase_name.table_name (? : mydb.usersormydb.*); 3. inderifytheexact'username '@'host'Account; 4.optionallyRevokeg
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MySQL? ??? ??? ????? ??????
acharactersetdines whichcharcterscanbested, whileAcollationstermineshowtheyarecomegandsorted.1. charactersets-windinternational Characters.2
Aug 11, 2025 pm 05:22 PM
SQL Server?? MySQL? ???????? ??
?? ?? ?????. SQLServer?? MySQL? ????????? ??? ??, ??, ??????, ??? ? ??? ?????. 1. ?? ??????? ????, ??? ???, ??? ? ? ??? ??? ?????. 2. intauto_increment? ?? ???, nvarchar to varchar ? UTF8MB4 ?? ??? ???? ?? ?? ??? ?? ??? ????, Datetime? ??, ??? Tinyint (1), ??? ??? to Char (36) ?? Binary (16)? ?????. 3. MySQLworkBench ?????? ???, ?? ???? ?? ?? AWSDMS? ?? ?? ??? ??
Aug 11, 2025 pm 04:09 PM
MySQL?? WHERE ?? ???? ??
theWhereClauseInMySqlFiltersRecordSbasedOnspecifiedConditions.1.itusiedInSelect, Update, andDeletesTatementStoAffEctOnlyMatchingRows.2.comParisonOperators like =,! =, =, allogicaloperators, ??, andnotcombinemultipleconditions, ?? ??
Aug 11, 2025 pm 03:54 PM
MySQL???? ?? ?? ??
mysqldoesnothavebuilt-inrow-levelsecurity, butitcanbeimplementedusingviews, storedProcedures, andaccessControl.1.UseViewStofilterrowsBasedOnTheCurrentUserByLeveragingFunctionslikeCurrent_User () andAmpingTableTorStrictDAtAvisibitied.2
Aug 11, 2025 pm 01:33 PM
MySQL? ??? ?? ? ?? ???? ???? ??
MySQL? ? ???? ???? ????? ??, ??? ?? ? ?? ?? ?? ??? ???????. 1. ??? ??? ??? ?? information _schema.columns? ???? Unionall ? ?? ??? ?? ??? ????? ???? ?? ?????. 2. ??? ???? ??? ?, ?? ??? ???? ISNULL ??? ???? ? 1 ?? ? 2?? ???? ?? ?? UnionAll? ???? ??? UnionAll? ??????. 3. ?? ??? ?? ?? ?? ???? ??? ? ??? ???? ? ???? ???? NULL SAFE ?? ???? ???? ? ?? ?? ??? ??????. 4. ?? ? ??? ?? ??? ???? Count (*)? ?? ??? ? ????.
Aug 11, 2025 pm 12:14 PM
? ??? ??? ???? ?? MySQL ???
TOUSEMYSQLEFICLEASAMESSAGEQUEUNDERHIGH-THROUGHPUTWORKLOADS : 1) useInNodbbitHproperIndexing —CreateCompositeIndeSeldeSeldsIndsikeVequeue_nameAndStatus, avoidexciessiveDexestomainInsertperformance.2) a usebatchoperations —inse
Aug 11, 2025 am 11:26 AM
MySQL?? ??????? ???? ??
mysqldump? ???? ?? MySQL ??????? ???? ?? ????? ???? ?????. ??? ?? ? ???? ?? ? SQL ????? ?? ? ? ????. 1. ?? ??? ??? ????. mysqldump-u [user name] -p [database name]> backup_file.sql???. ?? ? ??? ???? ?? ??? ??????. 2.-databases ???? ?? ??????? ?? ?? : mysqldump-uroot-p-- databasesdb1db2> multip_dbs_backup.sql. 3. all-databases : mysqldump-uroot-p? ???? ?? ??????? ?????
Aug 11, 2025 am 10:40 AM
MySQL?? ?? ??? ???? ??
searchEdcaseIsusedForcomplexConditionswithexplicitCorisons -like>,
Aug 11, 2025 am 10:29 AM
MySQL?? ??? ??? ??? ???? ??? ??????
MySQL? ????? ??? ?????. ????? _ci Collation? ??? ???? ?? ??? ???? ? ?????. 1. ?? ??? ??? Collation (? : UTF8MB4_GENERAL_CI)? ???? ??? ? ????? ???? ??? ?????. 2. Lower () ?? Upper () ??? ???? ??? ??? ??? ??? ??? ????? ??? ??? ??? ??????????. 3. Collate? ???? ?? ??? ??? ????? ???? ?? ?? ??? ?? ???. 4. MySQL? Ilike ???? ???? ??? Lower ()? ????? ??? ??? ???? ?? Collate? ?????; ?? ??? ?? _ci Collation? ????? ???? ????.
Aug 11, 2025 am 09:47 AM
MySQL?? ???? ?? ??? ???? ??? ??????
MySQL ??? ????? ???? ?? ??? ???? ????? ?? ??? ????? ??? ? ?? ??? ?? ?? ???? ??? ?? ????? ?? ??? ?? ???? ???????. ?? ??? ??? ????. 1. SetGloBalevent_scheduler = on? ????? ??? ?? ???? ??? ??????. 2. Createevent? ???? Deletefromlogswherecreated_at? ?? SQL ??? ?? ? ?? ??? ??????.
Aug 08, 2025 pm 05:43 PM
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?? ?? ? ?? ???? ???? ?? ???? ????? ???? ?? ???????. ?? ? ?? ??? ?? ? ? ????. 1. ??? ??? ??? ??? ?? ondeletecascade? ???? ?? ?? ??? ? ?? ?? ?? ???? ????? ?? ?? ???? ????? ???? ?????????. 2. ?? ??? ???? ???? ?? ?? CTE? ?? ? ??? ???? ????? ???? ??????. ?? ??, ??? ??? ?? ?? ??? ?? ??? ??????. 3. ?? ? ???? ?? ? ?? (setforeign_key_checks = 0) ? ????? ?????? ?? ?? ?? ??? ? ? ???? ??? ??? ???? ?????? ???? ??? ? ????. ?? ??? ?? CTE? ??? ??? ???? ????.
Aug 08, 2025 pm 05:40 PM
MySQL ???? ???? Python?? ??? ???? ??
MySQLConnector? ???? Python?? ??? ????? ?? MySQL-Connector-Python ?????? ???? ??? ?? ?????? ??? ?? ? ?? ?? ??? ???? SQL ?? ???? ?? ??? ?? ??? ??? ????? ???????. 1. ?????? ?????? : PipinStallMysql-Connector-Python; 2. ????? ?? ?? : importmysql.connector; 3. ?? ?? : conn = mysql.connector.connect (host = 'localhost', user = 'your_usern
Aug 08, 2025 pm 05:39 PM
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