?????? ?? ???? DBMS? ?? ????. SQL Server??? ?? ??? ??? ?? ? ? ??? ?? ? Alter Database? ??????. MySQL??? ?? ??? ??? ? ???? ? ??????? ???? MySQLDUMP ?? ?? ??? ???? ?? ???? ?? ? ?? ?? ??? ??????. PostgreSQL?? Alter Database? ?????? ... ?? ??? ???? ?? ??????? ?? ? ? ??? ????. SQLITE??? ??? ?? ?? ??? ???? ?? ??? ??? ????. ????? ????? ??? ??? ??? ??? ????? ??????? ???? ?? ?? ??????? ??????.
SQL?? ??????? ??? ??? ??? ?? ?? SQL ??? ?? ??? ???? ?? ?????? ?? ??? (DBMS)? ?? ????. ?? ???? ????? ???? ??? ??? ????.
Alter Database ?? (SQL Server)
Microsoft SQL Server ??? MODIFY NAME ??? ???? ALTER DATABASE ?? ???? ?????? ??? ?? ? ????.
Alter Database Old_database_name ?? = new_database_name;
??? ?? :
- ??? ??????? ???? ??????.
- ??? ??????? ???? ?? ??? ??????. ??? ?? ?? ?? ??? ??? ??? ? ????.
?????? ALTER DATABASE OLD_DATABASE_NAME SENT SILE_USER ?? ??? ?? ?????. Alter Database old_database_name modify name = new_database_name; Alter Database New_database_name Set Multi_user;
MySQL?? : ?? ??? ???? ????
MySQL? ?? RENAME DATABASE ??? ???? ??? ??? ?? ???? ?? 5.1? ?? ?? ??? ???????.
?? ?? : ??? ????.
- ? ??????? ????.
- ?? ???????? ?? ???? ? ???? ??????.
- ?? ??????? ??????.
?? ??? mysqldump ??? ? ????.
mysqldump -u username -p old_database_name> old_db_dump.sql mysql -u username -p -e "?????? ??? new_database_name" mysql -u username -p new_database_name <old_db_dump.sql mysql -u username -p -e "drop database old_database_name"
?? ??? ?? ??? ???? ?? ? ???? RENAME TABLE ??????.
?????? ?? new_database_name; ?? ??? ??? old_database_name.table1 to new_database_name.table1; - ?? ???? ?? ?????? DROP DATABASE OLD_DATABASE_NAME;
PostgreSQL : Alter Database? ??????
PostgreSQL ??? ??? ???? ?????? ??? ?? ? ????.
Alter Database Old_name ?? Rename?? New_Name;
?? ?? :
- ?? ??????? ???? ?????? (??? ???? ??).
- ??? ???? ??????? ?? ??? ???? ?? ??????.
- ???? ?? ??????? ??? ?????.
????? ??? ?? ??? ?? ? ? ????.
pg_terminate_backend (PID) ?? pg_stat_activity?? ??? datname = 'old_name'? pid <> pg_backend_pid ();
?? ?? ?? ?????? (? : postgres )?? ?? ?? ??? ?????.
Alter Database Old_name ?? Rename?? New_Name;
SQLITE?? : ?? ?? ??? ????
sqlite ??????? ???? ?? ???? ??? sqlite?? RENAME DATABASE ??? ????.
SQLITE ?????? "?? ???":
- ??? ?????.
- ?? ??? ???? ?? ??? ?????.
mv old_database.db new_database.db
- ? ???? ??????? ?? ?.
- SQL Server :
ALTER DATABASE ... MODIFY NAME. - MySQL : ?? ?? ?? - ??, ??, ?? ?? ? ??.
- PostgreSQL :
ALTER DATABASE ... RENAME TO? ?? ??????. - SQLITE : ?? ??? ?? ????.
??
?? ??? ???? ?? ?? ??????? ??????. ????? ???, ?? ? ??? ??? ?? ?? ? ????. ????? ???? ??? ?? ? ???? ??? ??? ?????.
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Undress AI Tool
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Stock Market GPT
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SublimeText3 Mac ??
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SQL? ??? ?? ?? ??? ???? ??? ??????
Sep 21, 2025 am 05:22 AM
UseCommentOncolumnoraltertablewithCommentTodocumentTables ? ColumnsInsql; syntaxvariesBydbms - postgresqlandoracleUsecommenton, mysqlusescommentincreate/alterstatements ? andcommentscanbeviewedviasystemtablikedinformation_schema, rantsuppport.
SQL?? ?? ??? Soundex ??? ???? ??? ??????
Sep 21, 2025 am 01:54 AM
SoundEx ??? ???? ??? ???? 4 ?? ??? ???? ? ?? ??? 3 ??? ???? ??? ?? ??? ????, ??? ??? ?? ??? ??? ??? ???? ?? ?? ??? ?????. ?? ??, Smith? Smythe? ?? S530? ???? ??? ??? ?? ??? Wheresoundex (last_name) = soundex ( 'Smith')? ?? ?? ? ????. ?? ??? ???? ??? ?? 0?? 4? ??? ??? ????, ?? ?? ??? ??? ? ? ???, ?? ?? ??? ??? ? ????? ?? ??? ??? ??? ??? ?? ??????? ???????.
SQL?? ??? ?? ID? ?? ??? ??????
Sep 20, 2025 am 04:40 AM
TogetThelastInsertedid, usedatabase-specificftions : mysqluseslast_insert_id (), postgresqlusesreturningclause, sqlserverusesscope_identity () oroutput, andsqliteuseslast_insert_rowid (); ?? callcrightrightterafttoccuracy.
SQL ?? ?? ? ?? ??? ???? ??? ??????
Sep 24, 2025 am 04:27 AM
CreateTable? ??? ?? ?? ? ???? ????? AltertableAddConstraint? ???? ?? ???? ?? ??? ???? ?? ?? ???? ?? ? ?? ?? ?? ??????. ???? ?? ???? ???? ????????. DropConstraint? ?? ???? ?? ??????? NULL ?? ?? ?????? ??? ? ????.
SQL?? ??? ??? ?? ??? ?? ?? ??? ??????
Sep 18, 2025 am 12:57 AM
??? _day () ?? (MySQL, Oracle)? ???? ??? ??? ??? ? ( '2023-10-15')? ?? 2023-10-31? ?????. 2. SQLServer? Eomonth () ??? ???? ??? ??? ?????. 3. PostgreSQL Date_trunc ? ??? ?? ??? ?????. 4. sqlite? ?? ??? ???? 'startofmonth', '1month'? '-1day'? ???? ??? ????.
SQL? ???? ?? ??? ??????
Sep 21, 2025 am 01:40 AM
themin () functionlerievesthesmallestvaluefromaspecifiedcolumn.useitinaSelectStatementwhowerGroupByClaUsestOfilterorGroupData, SuchASFindingThelowestSalary, ??, OrfirstalPhabeticalName.
SQL?? Guid ?? UUID? ???? ??? ??????
Sep 19, 2025 am 02:41 AM
sqlserverusesnewid () togenerateguids; 2.mysqlusesuuid () ferversion1uuids; 3.postgresqlusesgen_random_uuid () ??? ? ??? ? ??, 4.sqlitelacksbuilt-insupport, sogenerateuuuidsinapplicationcode.
SQL? WHERE ??? ?? ??? ???? ??
Sep 21, 2025 am 01:26 AM
asubqueryinthewhereclauseallowsfilteringdatabasedondynamamicresultsfromanotherquery, in, in, nottin, ornotexists, wherebqueryrunsfirstanditsresultinflueTurecer'Supepput;
