syntaxsql コピー ALTER TABLE { database_name.schema_name.table_name | schema_name.table_name | table_name } { ALTER COLUMN column_name { [ type_schema_name. ] type_name [ ( { precision [ , scale ] } ) ] [ COLL
alter_table::= Text description of alter_table Groups of ALTER TABLE syntax: alter_table_clauses::= alter_table_partitioning::= alter_column_clauses::= alter_constraint_clauses::= alter_column_properties::= alter_external_table_clause::= move_table_clause::= enable_disable_clause...
ALTER TABLE is used to modify tables, including modifying table definitions, renaming tables, renaming specified columns in tables, renaming table constraints, setting ta
ALTERTABLEtable_name RENAMECOLUMNold_nametonew_name; To rename a column in a table in SQL Server, use the following syntax: SQL Server: EXECsp_rename'table_name.old_name','new_name','COLUMN'; ALTER TABLE - ALTER/MODIFY DATATYPE
Here, the SQL command adds a column namedphoneto theCustomerstable. ALTER TABLE Syntax The syntax of the SQLALTER TABLEstatement is: ALTERTABLEtable_name clause supporting_codes; Here, table_nameis the name of the table to be modified
ALTER TABLE ändert eine Tabellendefinition durch Ändern, Hinzufügen oder Löschen von Spalten und Einschränkungen. Mit ALTER TABLE können Sie zudem Partitionen neu zuweisen und erstellen oder Einschränkungen und Trigger deaktivieren und
Syntax #1 To add a column to an existing table, the ALTER TABLE syntax is: ALTER TABLE table_name ADD column_name column-definition; For Example: ALTER TABLE supplier ADD supplier_name varchar2(50); This will add a column calledsupplier_nameto thesuppliertable. ...
Syntax ALTER TABLEtable-Name{ ADD COLUMNcolumn-definition| ADDCONSTRAINT clause| DROP [ COLUMN ] column-name [ CASCADE | RESTRICT ] DROP { PRIMARY KEY | FOREIGN KEY constraint-name | UNIQUE constraint-name | CHECK constraint-name | CONSTRAINT constraint-name } ...
4>.RENAME TABLE能将表中的数据,索引,主键定义都自动转型到新表下,但视图和对原表分配的权限不能自动转型到新表,需要手动执行 六.TRUNCATE TABLE语句 1>.查看TRUNCATE TABLE语句的帮助信息 mysql>?TRUNCATETABLEName:'TRUNCATE TABLE'Description: Syntax:TRUNCATE[TABLE]tbl_nameTRUNCATETABLEempties atablecompletely....
SQL database in Microsoft Fabric Specifies a set of options that can be applied to an index that is part of a constraint definition that is created by usingALTER TABLE. For a complete description of index options, seeCREATE INDEX. Transact-SQL syntax conventions ...