SQL? OLAP ?? ??
SQL? ???? ?? olapcube? ???? ????? ??, ?? (? : ??, ??, ?? ??) ?? (? : ??, ??)? ???????. 2. ??? ? ?? ?? ??? ???? ?? ? ??? ???? ?? ??? ?? ??? ??? ???? ??? ?? ??? ????. 3. ?? ???? ????? ??? ? ?? ??? ?? ??? ???? ???? ?? ??? ???? ??????. 4. ?? ??? ??? ?? ?? ??? ???? ??? ??? ????? ??? ??? ?? ?? ??? ???????.
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SQL ????? Azure Data Studio
Azuredatastudio? ?? ?? ? ?? ?? ??? ??? ??? ??? ??? SQL ?? ?????. 1. VSCODE? ??? ?????, ?? ?? ??? ???? ?? ?? Azure ??????? ??? ? ????. 2. ?? ???? ??????? ?? ?? ??, ?? ???? ? ??? ?? ????? ?????. 3. ???? ???? ??? ??, ??? ?? ?? ? ??? ??? ?? ?????. 4. ?? ??? ????? ??? ???? ???? ??? SSM ?? ?? ?? ??? ???????.
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Oracle?? ???? ????? ???? ??? ??????
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SQL? ?? ?? ?? ? ?? ??? ???? ??????
AprimarykeyCannotContainnullValues, whileiqueConstraintTyprimicallyAllowsonEnullPerColumn; 2.AtableCanHaveOnlyOnePrimaryKeyButMultipleUniqueConstraints; 3. BothecreateUniqueIntEdexes, ??? PrimaryKeysOftCreateClusteFaultinSomedaBaseS;
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MySQL ????? ?? ??? ??? ???? ??? ??????
MySQL ????? ?? ??? ??? ????? Modify ?? Change ?? ?? Altertable ?? ??????. 1. ??? ???? ??? ??? ?? ? ????? ?? ??? ??? ????. ??? Altertable ??? ?? ?? ? ?? ?? ? ??? ?? [???], ? : AltertableUsersModifyAgetInintNOTNULLDEFAULT0; 2. ?? ??? ???? ? ??? ??? ??? ??? ???? ??? Altertable ??? ?? ?? ?? ? ?? ? ? ?? ? ??? ?? [???], ? : AltertableUserschangeageser_???.
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MySQL?? ?? ???????? ???? ???? ??? ??????
loadDatainfileisTheFastestestestestestmethodforbulkimportingdataintomysql.1.usethebasicsyntaxwithfilepath, field/linedelimiters, andoptiona lcolumnlist.2.forserver-sidefiles, ensurethefileisaccessibletemysqlserverandtheuserhasfileprivilege.3. forclient-sidefiles, u
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SQL? ???? ?? ???? ??? ??? ??????
mysql? date_format (now (), '%y-%m-%d')? ?? date_format () ??? ?????. 2. PostgreSQL? to_char (now (), 'yyyy-mm-dd')? ?? to_char () ??? ?????. 3. sqlserver? format () ?? convert () ??? ?????. 4. sqlite? strftime ( '%y-%m-%d', 'now')? ?? strftime () ??? ?????. ? ?????? ????? ?? ?? ?? ??? ????? ??? ?????.
Aug 05, 2025 pm 07:14 PM
SQL?? ?? ???? ??? ??????
SQL ???? ???? ??? ?????? ???? ?? ????. 1. PostgreSQL? generate_series () ?? ??? ??? ?????. 2. SQLServer? ?? CTE ?? ???? ?????. 3. Oracle? ConnectByLvel? ?????. 4. MySQL8.0 ? Sqlite ?? ?? CTE; 5. ?? ???? ???? ??? ?? CTE? ???? ??? ?? ? ? ????. ?????? ?? ? ?? ????? ?? ??? ??? ???????.
Aug 05, 2025 pm 06:56 PM
?????? ??? ???? SQL? ?? ??? ????? ??? ??????
DatabasestaticsImproveQueryPerformanceBectoryOptimizeToMakeInexecutionPlandeCisionsBasedAccuRatedAccuRatedAccuRattibutionandCardinality; 1) staticSIticsInScludErowCounts, ??? ?, ????? ? ?? ????; 2) KeepStatist? ?????
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MySQL? ?? ?? ?? : ?? ? ??? ??
MySQL ?? ??? ? ? ??? ??? ?? ?? ??? ????? ???? ? ? ??? ??? ?? ?? ?????. ????? ?? ??? ??, ?? ?? ??, ??? ??? ?? ? ?? ???? ?? ??? ?????. showengineinnodbstatus? ?? ?? ?? ??? ??? innodb_print_all_deadlocks? ?? ?? ?? ?? ??? ?? ? ? ????. ?? ????? ?? ?? ??? ????, ? ?? ????? ????, ?? ????? ??? ???? ?? ?? ??? ????? ???????.
Aug 05, 2025 pm 05:52 PM
SQL ???????? ?? ??? ???? ??????
AviewinSQLisavirtualtablebasedonasavedSELECTquerythatsimplifiesdataaccessandenhancessecurity.1.Tocreateaview,useCREATEVIEWwithaSELECTstatementtodefineitsstructure.2.Tomodifyaview,useCREATEORREPLACEVIEWorALTERVIEWdependingonthedatabasesystem.3.Todelet
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SQL? ?? (?? ????) ???? ???? ??? ??????
ExceptreturnSrowsfromsfirstqueryNotpresentinthescond, MatchingColumnCountandandCompatiBledAtAtypes, withDuplicatesRemovedAndResultColumnNamesfromtheFirstQuery; 1.OrderMatters : aexcreptB ≠ ≠ bexcepta; 2.DuplicatesAreAUtomecations;
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SQL? ???? ???? ??? ??????
SynonymsInsqlareAlternAnamesfordAtaBaseObjectsThatsimplifyAccess, ?? ?? ???, ProvideLocationTransparency, andenhancesecurityThroughAbStraction.1
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