To rename a column in an existing table, the ALTER TABLE syntax is: ALTER TABLE table_name RENAME COLUMN old_name to new_name; For example: ALTER TABLE supplier RENAME COLUMN supplier_name to sname; This will rename the column calledsupplier_nametosname....
You can also use the COLLATE clause in the ALTER TABLE command when appropriate (primary key or foreign key). FieldType [(nFieldWidth [, nPrecision])] Specifies the field type, field width, and field precision (number of decimal places) for the new or modified field. FieldType is a ...
CopyCommandFileFormatType CopyCommandIdentityInsert CopyCredentialOption CopyOption CopyOptionKind CopyStatement CopyStatementOptionBase CreateAggregateStatement CreateApplicationRoleStatement CreateAssemblyStatement CreateAsymmetricKeyStatement CreateAvailabilityGroupStatement CreateBrokerPriorityStatement CreateCertificateStatement...
sys.tables sp_rename sp_help EVENTDATA CREATE TABLE DROP TABLE ALTER TABLE column_constraint ALTER TABLE column_definition ALTER TABLE computed_column_definition ALTER TABLE index_option ALTER TABLE table_constraintsFeedback Was this page helpful? Yes No Provide product feedback | Get help at Micro...
* SQL Server * SQL 托管实例 语法 syntaxsql ALTERDATABASEdatabase_name{<add_or_modify_files>|<add_or_modify_filegroups>}<add_or_modify_files>::={ADDFILE<filespec>[ ,...n ] [TOFILEGROUP{filegroup_name} ] |ADDLOGFILE<filespec>[ ,...n ] |REMOVEFILElogical_file_name|MODIFYFILE<filespec...
In this article Syntax Arguments Remarks Permissions Show 2 more Renames a database user or changes its default schema. Transact-SQL Syntax Conventions Syntax ALTER USER userName WITH <set_item> [ ,...n ] <set_item> ::= NAME = newUserName | DEFAULT_SCHEMA = schemaName | LOGIN = login...
This clause renames only files in the control file. It does not actually rename them on your operating system. The operating system files continue to exist, but Oracle no longer uses them. If the old files were Oracle managed, Oracle drops the old operating system file after this statement ...
This command element is used in a statement of the Execute Method (XMLA) call over an XMLA endpoint, exposed in the following ways: As an XMLA window in SQL Server Management Studio (SSMS) As an input file to theinvoke-ascmdPowerShell cmdlet ...
1. drop：删除数据库 drop语句将表所占用的空间全释放掉。drop > truncate > delete 方式1：如果要...
(20);"; String sql2 = "alter table zhao1 drop test;"; String sql3 = " alter table zhao1 change age age1 int;"; String sql4 = "alter table zhao1 rename zhao;"; String sql6 = "alter table zhao add primary key (name);"; String sql7 = "alter table zhao add unique (name);...