若要建立分割區配置,請參閱 CREATE PARTITION SCHEME (Transact-SQL)。 column_name 指定分割索引分割的數據行。 此資料行必須符合 partition_scheme_name 所使用資料分割函數引數的資料類型、長度與有效位數。 filegroup_name 指定用來儲存叢集數據行存放區索引的檔案群組。 如果未
syntaxsql Copy -- Create a clustered columnstore index on disk-based table. CREATE CLUSTERED COLUMNSTORE INDEX index_name ON { database_name.schema_name.table_name | schema_name.table_name | table_name } [ ORDER (column [ , ...n ] ) ] [ WITH ( <with_option> [ , ...n ] ) ...
可使用sys.columns (Transact-SQL)、sys.column_encryption_keys (Transact-SQL)和sys.column_encryption_key_values (Transact-SQL)查看列加密密钥的相关信息。 权限 需要ALTER ANY COLUMN ENCRYPTION KEY 权限。 示例 A. 创建列加密密钥 下面的示例创建名为MyCEK的列加密密钥。
alter table Vendors drop column vend_phone; 1. 2. 删除表(简单):不是删除内容;drop table drop table CustCopy; 1. 我想试试对有数据的表使用drop table, mysql会不会有防止意外删除的功能: CREATE table CustCopy as select * from Customers; drop table CustCopy; 1. 2. 3. 并没有任何提示和阻止...
SQL USEAdventureWorks2022; GO-- Creates a nonclustered index on the Person.Address table with four included (nonkey) columns.-- index key column is PostalCode and the nonkey columns are-- AddressLine1, AddressLine2, City, and StateProvinceID.CREATENONCLUSTEREDINDEXIX_Address_PostalCodeONPerson....
Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance The xml data type is a built-in data type in SQL Server and is somewhat similar to other built-in types such as int and varchar. As with other built-in types, you can use the xml data type as a column type when...
altertablePersonsalterCOLUMNCityDROPDEFAULT; 3、添加列 altertablestudentaddcol_addint;--add 要加的列名类型 三、DROP 1、撤销索引 dropindexstudent.index_id;--接的是table_name.index_name 2、删除表 droptablestudent; 3、删除数据库 dropdatabaseXinrongDatabase; ...
CREATE INDEX 既可以创建一个可改变表的物理顺序的簇索引,也可以创建提高查询性能的非簇索引。其语法如下: CREATE [UNIQUE] [CLUSTERED | NONCLUSTERED] INDEX index_name ON {table | view } column [ ASC
Applies to: SQL Server 2008 (10.0.x) SP 1 and later versions. Specifies the assembly and method to which the created function name shall refer. assembly_name - must match a value in the name column of SELECT * FROM sys.assemblies;. The name that was used on the CREATE ASSEMBLY statemen...
drop column 列名 例如: alter table Student drop column StudentId --删除 StudentId列 5.修改列 语法: alter table 表名 alter column 列名 数据类型 咧如: alter table Student alter column StudentId nvarchar(50) --修改 StudentId列数据类型为 nvarchar(50) ...