MySQL?? ??? ??? ???? ??
Curdate ()? ?? ??? ???? ??? ??? ????? ??? ????? ???????. 1. ?? ?? : selectCurdate ()? ?? ??? ?????. ?? ??, 2025-04-05, ??? current_date ?? current_date ()? ??? ?? ????. 2. WHERE ??? ??? ???? ??? ? ? ??? ?? ?? ? ?? ?? ??? ? ????. DateTime ?? ? ?? ?? (Order_Date) = Curdate () ???? ???? ?? ?? Order_Date> = Curdate () andorder_date = curdate ()-Interval3? ???????.
Aug 11, 2025 pm 11:54 PM
MySQL?? ???? CSV ??? ???? ??
CSV ??? ??? MySQL ???? Select ... into OutFile ?? ?? ?? ? ? ???, ?? ???? ???? ??? ?? ?????. 1. select ... intooutfile ??? ???? ?? ??? ??? ??? CSV ??? ???. 2. ???? ??? Secure_File_PRIV ??? ?? ???? MySQL ????? ?? ??? ??? ??????. 3. ?? ??? ?? ??? ? ??? ??? ??? ?? ??????. 4. ???? ?? ??? ??????. 5. ??? ???, ??? ? ??? ???, ??? ? ??? ????? ?? ?? ??, Enclosedby ? LinestermintedBy? ?? ??? ? ????.
Aug 11, 2025 pm 11:24 PM
MySQL?? ??? ??? ??? ???? ??
????? MySQL? Select Query? Case Insensivity ?? ?? (? : UTF8MB4_General_CI)? ??? ?? ?? ??? ???? ????. ??? ??? ??? ????? ?? ??? ??? ? ????. 1. Select*ourShowsHowsHowshowsBinaryUserName = 'Johndoe'? ?? ?? ??? ?? ?? ???? ??????. 2. Collate ?? ???? WhereSernameCollateUtf8mb4_bin = 'Johndoe'? ?? ??? ??? ?? ??? ??????. 3. ?? ???? ????? ??? ? ?? ???? ??? ?? ???? ?????.
Aug 11, 2025 pm 10:39 PM
MySQL?? ???? ??? ?? ??
tofindthesizeofescifictibleInmysql, querytheInformation_schema.tablessByPlacing'Your_database_name'and'your_table_name'intheprovidedSqlstatementTogetTHETOTALSIZEINMB.2.TOLISTALLSTALLISTABASERDBYSIZE, USETHEMATION_SCHATERMEMA.TCHEATHETHEN, USETHEMATION_SCHATERMEA
Aug 11, 2025 pm 10:24 PM
MySQL? ???? ???? ???? ??
InsertInto ?? ???? MySQL ???? ???? ??????. 1. ?? ??? ??? ????. insertinto ??? ?? (? 1, ? 2, ...) ? (? 1, ? 2, ...); 2. ?? ?? ?? ? ? ?? ?? ?? ???? ?? ?? ?? ?? ?? ? ? ????. 3. ?? ?? ???? ???? ????? ?? ? ? ?? ? ??? ?? ? ? ????. 4. ? ??? ?? ?? ???? ?? ?? ? ? ???, ??? ?? ???? ???????, ?? ?? ?? ???? ?? NULL? ???? ??? ??? ??? ????. 5. insertignore? ???? ?? ??? ???? ???? ??? ????? onduplicatekeyUpdate? ?????. 6. ?? ???? ?? ? ?? ??, ??? ?? ?? ?? ? ??? ??? ??? ?????.
Aug 11, 2025 pm 10:15 PM
'MySQL Server? ??????'??? ???? ??
??, ??? ?? ??? ?? ???? ???? ?? Wait_Timeout ? Interactive_timeout? ?? ???? ?????. 2. ??? ??? ??? ???? ?? Max_allowed_packet ?? ??? ?????. 3. ?? ?? ???? ???? ?? ??? ??? ??? ?? MySQL ?? ?? ? ??? ???? ??????. 4. ?? ???? ???? ?? ?? ?? ? ?? ? ?? ????? ?????. 5. ???, ??? ?? ?? ??? ?? ?? ??? ???? ?? ? ??? ????? ???? ??? ?????.
Aug 11, 2025 pm 09:57 PM
MySQL ?????? ? ???? ??? ?? ??? ??????
Tocheckthesizeofescificdatabase, useAselectQuerywithwheretable_schema = 'your_database_name'meTofilterByDatabasEname.2.TolistAllDatabases? ?? withtheirsized, runAgroupByQueryOntable_scheMawithoutaWhereClaUseanUseanBysizeScending.3
Aug 11, 2025 pm 09:51 PM
MySQL?? ?? ?? ???? ??? ??????
themoscommonlyousedjointypesinmysqlareinnerjoin, ?? ??, ??? ?? ? ????? ? ?? ??, extermininghowsfromtwoormoretablesarecombinedbasedonmatchingcolumnvalues; innerJoineTurnSonlymatchingrows, leftjoinincludesllowsfromthefthithtn
Aug 11, 2025 pm 09:45 PM
mysqldump? ???? ??????? ???? ??
MySqlDump? ???? ???? ??????? ????? ?? ?? ?? ? ?? ??? ????????. 1. ??? ???? ?? ??????? ???? MySqlDump-uusername-pdatabase_name> backup.sql, ???? ??? ????? ???? ?????. ?? ? SQL ???? ??????? ???? ? ??? ?? ??? ?? ? ???? ???? ????. 2. ?? ??????? ??? ? mysqldump-uusername-p-databasesdb1db2> multip_dbs_backup.sql? ??-databases ??? ???? ?? ???? ??????? ???? ?? ?????. 3. ?? -
Aug 11, 2025 pm 09:44 PM
MySQL ???????? ?? ??? ???? ?? ??? ??????
MySQL?? ?? ???? ???? ???? information_schema? ?? ? ? ????. 1. ?? ??? ???? ?? ???? ???? ???? ? ??? ???????? ?? ???? ???????. 2. ?? LeftJoin? ???? Table_Constraints? ???? ?? ?? ?? ?? ?? ???? ??? ??? ?? ????. 3. ?? ??????? ?? WHERE ??? Table_Schema ? ???????. ? ??? ????? ???? ?? ? ??? ???? ??? ? ??? ?? ?? ???? ???? ????? ?? ? ? ????.
Aug 11, 2025 pm 07:49 PM
MySQL?? Not Operator? ???? ??
MySQL??? NOT ???? ?? ??? ??? ????? ? ?????. 1. ?? ??? SelectColumn1, collect2fromtable_namewherenotCondition, ?? ?? ? ?? ?? ??; 2. ???? ?? ???? ?? ???? ??? ??? NULL? ?? ? ?? ?? ??? ?? ? ? ????. 3. NOTBetge? ???? ?? ???? ?? ??????. 4. ??? ??? ???? ?? ???? ?? ? ??????. 5. ?? ?/?? ??? ???? ??? ?? ??? ?? ??? ??? ?? ??? ?? ??? ????? ? ???????. ???, ? ??? ???? ?? ??? ??? ??? ??????. ?????, ??? ? ??? ???? ??? ??? ??? ????? ???????.
Aug 11, 2025 pm 07:16 PM
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
Aug 11, 2025 pm 06:34 PM
MySQL? ??? ??? ????? ??????
acharactersetdines whichcharcterscanbested, whileAcollationstermineshowtheyarecomegandsorted.1. charactersets-windinternational Characters.2
Aug 11, 2025 pm 05:22 PM
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