SQL Server: EXECsp_rename'table_name.old_name','new_name','COLUMN'; ALTER TABLE - ALTER/MODIFY DATATYPE To change the data type of a column in a table, use the following syntax: SQL Server / MS Access: ALTERTABLEtable_name ALTERCOLUMNcolumn_name datatype; ...
Sql Server 可以用 exec sp_rename '表名称.原列名','新列名','column';
alter table 表名 add 列名 类型 after column_x; 1. 5)修改表名 alter table 表名 rename 新表名; 1. 二、约束Constraints Constraints can be column level or table level. 约束可以是列层次,也可以是表层次。 Constraints are used to limit the type of data that can go into a table. This ensur...
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 ] } ) ] [ COLLATE collation_name ] [ NULL | NOT NULL ] } | ALTER INDEX inde...
权限:执行sp_rename操作的用户需要具有 ALTER 权限。 4. 序列图示意 我们可以使用序列图来说明重命名表的过程。以下是一个简单的序列图,展示了用户如何请求重命名表的操作,以及SQL Server是如何进行处理的。 SQL Server用户SQL Server用户EXEC sp_rename 'Employees', 'Staff'执行成功,表名已更改 ...
ALTER TABLE modifies a table definition by altering, adding, or dropping columns and constraints. ALTER TABLE also reassigns and rebuilds partitions, or disables and enables constraints and triggers.
ALTER TABLE modifies a table definition by altering, adding, or dropping columns and constraints. ALTER TABLE also reassigns and rebuilds partitions, or disables and enables constraints and triggers.
•Altertable...dropcolumn[column_name]•Altertable...drop[index/key][index_name] 3>.案例展示 mysql> ALTER TABLE students ADD remarks VARCHAR(100); mysql> ALTER TABLE students DROP remarks; 五.RENAME TABLE语句 RENAME TABLE语句用来重命名一个或多个表名。
syntaxsql sp_rename[ @objname = ]'object_name', [ @newname = ]'new_name'[ , [ @objtype = ]'OBJECT'] 引數 [ @objname = ] 'object_name' 用戶物件或數據類型的目前限定或非限定名稱。 如果要重新命名的對像是數據表中的數據行,object_name必須是 formtable.column或schema.table.column。
[PK_Department_DepartmentID];ALTERTABLETest.DepartmentDROPCOLUMNDepartmentID; GOEXECUTEsp_rename'Test.Department.DepartmentIDNew','DepartmentID','COLUMN'; GOALTERTABLETest.DepartmentALTERCOLUMNDepartmentIDSMALLINTNOTNULL;ALTERTABLETest.DepartmentADDCONSTRAINTPK_Department_DepartmentID PRIMARYKEYCLUSTERED (...