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
Redis Sentinel? Redis ????? ???? ??????
redissentinelandisdisclusterDifferinarchitecture, ?? ???, ?? ? ? ???? ??
Sep 07, 2025 am 12:53 AM
SQL?? IF-ELSE? ??? ??? ???? ??? ??????
SQL? ?? ???? ???? ??? ??? ???? ?? ???? ?? IF-ELSE ??? ????. 1. ??? ??? ?? ??? ?? ?? ?? ???? ?? ??; 2. ?? ???? ???? ?? ???? ????? ?? ??? ???? ???? ????? ?? ????. 3. ?? ??? ?? ?? ?? ??? ??? ???? ?? ??; 4. MySQL? ?? ??? ????? ?? () ??? ????? ?? SQL? ????. 5. ??? ??? If ... ?? ????? ???? ?? ??? ? ??? T-SQL? ?? ???? ??? ?????. ???, ??? ??? ??? ??? ???? ?? ??? ???? ??? ?? ????? ?? ??? ??????? NULL? ?? ?? ??? ?? ?? ???????.
Sep 07, 2025 am 12:29 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
Append? ???? ?? ???? ?? ???? ??? ??????
??????? ???? ???? ??? ???? ????. ? ?? ???? ??? ????. 1. Redis? AppendKeyValue ??? ???? ??? ?? ???? ?? ??????. ?? ???? ??? ?? ? ???? ??? ?? ??????. 2. ????? s = "value"? ???? ??? ??? ????? io.stringio? ???? ??? ? ??? ? ??? ??? ??????. 3. str = "value"? ???? ? ????? ????? ?? ??? ??? ?? ? ?????????. ??, Redis? ??? ?? ??? ??? ?? ?????. ??? ? ??? ?? ?????
Sep 06, 2025 am 06:40 AM
Oracle? Spid?? SID? ?? ??
TofindSidfromagivenspidinoracle, usethev $ sessionandv $ processViewSwitHaJoinPaddr = addr; 1.RunSelects.sid, s.serial#, s.usernam E, S.Program, P.Spidfromv $ sessionsjoinv $ processpons.paddr = p.addrwhowsp.spid = '12345'; ?? '12345 'WithTeactualspidTogetTheCo? ?????
Sep 06, 2025 am 05:58 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
SQL ????? ?? ??? ?? ??? ??????
???? ?? ??? ???? ?????? ???? ?? ??? ??? ???????. 1. mySQL, SqlServer ? PostgreSQL? ??? ?? ??? ???? ?? information_schema.table_constraints? ??????. 2. MySQL?? showreatetable? ???? ?? ?? ??? ???? ??? Query Information_schema ?? ?, ?? ? ? ?? ??? ????. 3. postgresql?? pg_constraint ??? ???? ???? conrelid = 'table name':: regclass? ?? ?? ?? ?? ?? ??? ???? ?? ????. 4. sqlserver?? ??? ???? conrelid = '??? ??':: regclass? ?? ?? ?? ??? ?? ? ? ??????. 4.
Sep 06, 2025 am 05:48 AM
Oracle? Delete? Truncate? ???? ??????
deleteisAdmlcommandTheRrowsoneatimewithividuallogging, whiletruncateIsadlcommand thatdeallocatesforfasterExecution.2.deleteCanberolledBackwithinatsUctionSingundolologs, Whewereascateisgenerallynon-transactionallandibriblewi
Sep 06, 2025 am 05:45 AM
SQL?? ??? ???? ???? ??
GrangeAndAndRevokingPermissionsInsqlisdoneusinggrantAndAndAndAndAndAntAndAntAndArluserOrroLeaccessTodAbaseObjects, grantprovingedprivilegeslikeSelect, indupord, ??, ??, ??, ??, ?? ?? ?????, ?, ?, ?? ???? ??? ? ?? ?? ???? ?????
Sep 06, 2025 am 05:35 AM
SQL?? ?? ?? ??? ???? ??
afullouterjoinreturnsallrowsfrombothtables, withnullsfornon-matchingrecords, andissupportedinpostgresql, sqlserver, andsqlitebutnotinmysql, whereitcangeingsinglefingleftandjoinscomcombinedwithunion-incluthoricovernovericovernidevery-withilevericovernovereverevereverevereverevereverevereverevereallate
Sep 06, 2025 am 05:15 AM
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