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You can customize the separator by using the SEPARATOR keyword in the GROUP_CONCAT() function; 1. Use SEPARATOR to specify a custom separator, such as SEPARATOR'; 'The separator can be changed to a semicolon and plus space; 2. Common examples include using the pipe character '|', space'', line break character '\n' or custom string '->' as the separator; 3. Note that the separator must be a string literal or expression, and the result length is limited by the group_concat_max_len variable, which can be adjusted by SETSESSIONgroup_concat_max_len=10000; 4. SEPARATOR is optional

Removeunusedpackagesanddependencieswithsudoaptautoremove,cleanpackagecacheusingsudoaptcleanorautoclean,andremoveoldkernelsviasudoaptautoremove--purge.2.Clearsystemlogswithsudojournalctl--vacuum-time=7d,deletearchivedlogsin/var/log,andempty/tmpand/var

IFNULL()inMySQLreturnsthefirstexpressionifitisnotNULL,otherwisereturnsthesecondexpression,makingitidealforreplacingNULLvalueswithdefaults;forexample,IFNULL(middle_name,'N/A')displays'N/A'whenmiddle_nameisNULL,IFNULL(discount,0)ensurescalculationslike

TheLIKEoperatorinMySQLisusedtosearchforpatternsintextdatausingwildcards;1.Use%tomatchanysequenceofcharactersandtomatchasinglecharacter;2.Forexample,'John%'findsnamesstartingwithJohn,'%son'findsnamesendingwithson,'%ar%'findsnamescontainingar,'\_\_\_\_

Systemdisthefirstprocess(PID1)inmodernLinuxsystems,replacingolderinitsystemslikeSysVinitandUpstart,responsibleforbooting,managingservices,devices,logs,andusersessionsthroughasuiteofintegratedtools.2.Itusesunitfiles(.service,.timer,.socket,etc.)todefi

To check the size of the MySQL table, you can get it by querying information_schema.tables; the specific method is to use a SELECT statement to combine the data_length and index_length fields and convert it into MB units. You can view the data and index sizes for a single table, all tables, or separately. This method is suitable for most cases, but the values ​​are approximate. There may be differences for InnoDB tables. The most common and standard way is to query the tables table in the information_schema database to get the results.

Tochecktheeventschedulerstatus,useSHOWVARIABLESLIKE'event_scheduler';.2.Toenableordisabletemporarily,useSETGLOBALevent_scheduler=ONorOFF,whichremainseffectiveuntilthenextrestart.3.Toenableordisablepermanently,addevent_scheduler=ONorOFFunder[mysqld]in

DeadlocksinMySQLoccurwhentransactionsblockeachotherbyholdingneededlocks,butcanbemanagedeffectivelythroughprevention,handling,andmonitoring.1.Minimizedeadlocksbyaccessingrowsinaconsistentorder,keepingtransactionssmallandfast,usinglowerisolationlevelsl