Docker? ???? phpmyadmin? ???? ??
?? Docker ? DockerCompay? ?? ? ?? Docker-Compose.yml? ???? MySQL ? PhpmyAdmin ???? ??? ?? Docker-ComposeUP-D? ?? ????? ??? ?? ????? http : // LocalHost : 8080? ????? ?? ??? ???? Phpmyadmin? ?? ? ???? ???? ?? ??? ??????. ?? ???? ???? ??? ???? ?? ?? ??? ???? ?? ????.
Sep 06, 2025 am 02:01 AM
SQL?? ??? ??? ???? ??
count (*)? ? ?? ??? ??? ???? ???? ? ? ?? ?????. count (column_name)? ??? ?? ? ?? ?? ? ?? ?????. COUNT (CORESTCOLUMN_NAME) ?? ?? ? ? ? ?? ?? ?????. WHER ?? ???? ??? ??? ?? ? ? ??? GroupBy? ???? ???? ??? ??? ? ? ????. ??? ??? ???? ???? ???? ??? ??? ??? ??? ???? ????? ????? ????? ???? ??? ??? ?? ? ? ????.
Sep 06, 2025 am 01:03 AM
MongoDB?? ?? ??? ??? ????? ??
FilterDataEarlyUsing $ match ? $ projectTeorDucedOcumentVolumeAndsize.2.2. $ limit ? $ sortferficely withIndexesAndTop-Korksorting.3
Sep 06, 2025 am 12:34 AM
???? ?? ??? ??? ??????
Themaintypesofjoinsinoracleare : 1. innerjoineturnsonlymatchingrowsfrombothtables; 2.leftjoinreturnsallrowsfromthelefttableandmatchedrowsfromtheright, withnullsforunmatchedright-sidecolumns;
Sep 05, 2025 am 08:17 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
SQL?? ?? (?? ??? ?)? ?? ??? ??????
tofindTheModeInsql, FirstGroupByTheColumnAndTeFrequencyOfeachValue.2
Sep 05, 2025 am 07:41 AM
SQL?? ?? ? ??? ?? ?? ???? ?? ??? ??????
?? ? ??? ?? ? ?? ???? ???? ??? ?? ??? ???? ???? ?? ? ? ????. ?? ???? ??? information_schema.columns? ???? ????. 1. ?? SQL?? selectTable_namefrominformation_schema.columnswherecolumn_name = 'your_column_name'? ???? ??? ?? ?? ??? ??? ??????. ?? ??? ?? ??????? ?? ???? ?? table_schema ?? table_catalog ??? ?? ? ? ????. 2. SQLServer??? Sys.Columns ? Sys.ta? ??? ? ????
Sep 05, 2025 am 07:13 AM
MySQL?? ?? ???? ????? ??? ???? ??
useIndExSuggestSanIndexButallowsmysqltoIgnoreItifatablescanisbetter; 2.forceIndexRequirestHeOfScificIndExandPreventStablescans, timizerMakesPoorCoicesButmayDegradeperFormanceIfMissed;
Sep 05, 2025 am 06:53 AM
MongoDB?? ??? ???? ???? ??
ToensuredurableWritesinMongoDB, UseWriteConcernw : "???"ToConfirmWritesonAmaMaMaMaMaMaMaTecasetMembers, enableJournaling (Storage.journal.enabled : true) toprotectagainScrashes ? deployroperly-configuredsfortoleranc
Sep 05, 2025 am 06:52 AM
?? ??? ??????? MongoDB? ???? ??
mongbisidealfore-commerceduetoitsflexibledocumentmodel, chema-freejson-likedocuments? ???? ???? ????, itsupportsembeddataandarraysforproductvariants, ??, ? ??, while-indexingenhanceseperformanceOnfiel
Sep 05, 2025 am 06:46 AM
SQL? ID ???? ???? ???? ???? ??
ToinsertdataintoaSQLServertablewithanidentitycolumn,omittheidentitycolumnintheINSERTstatementforautomaticvaluegeneration,oruseSETIDENTITY_INSERTONtotemporarilyallowexplicitvalues,insertthedesireddataincludingtheidentityvalue,thenturnitoffwithSETIDENT
Sep 05, 2025 am 06:37 AM
SQL ?? ??? ????? ??? ??????
indexeSeffecticallyCreatingThemonwhere, Join, Orderby ? GroupByColumns, compositeIndexesformulti-columnfilters and avoidingover-indexingTeorduceWriteOverHead.2.OpTimizeQueryStructureBySelectingOnlyneedDcolumns, FipingFunctionSonIndExedColumns? ?????
Sep 05, 2025 am 06:15 AM
phpmyadmin?? ??????? ???? ??
Tocopyadatabaseinphpmyadmin, firstcheckifte "CopyDatabaseto"featureTheperationStab, selectSourcedatabase, enterthenewdatabaseMame, create/dropoptions, andclickgo.2.ifthatoptionisunavailab? ??????
Sep 05, 2025 am 05:50 AM
Oracle?? ???? ???? ??
usealterindexindex_namerebuildtorebuildanindex, whitesanewcompactversionandreplacestheoldone;
Sep 05, 2025 am 05:41 AM
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