CREATE[UNIQUE][CLUSTERED|NONCLUSTERED]INDEXindex_nameON<object>(column_name[ASC|DESC][,...n])[WITH<backward_compatible_index_option>[,...n]][ON{filegroup_name|"default"}]<object>::={[database_name.[owner_name].|
create clustered index index_name1 on test(inputTime) --在表中存在主键时无法创建聚集索引,并且一个表只能有一个聚合索引 drop index index_name1 on test --唯一聚合索引 sp_helpindex test create unique clustered index index_name3 on test(id) --在表中存在主键时无法创建聚集索引,并且一个表只能有...
create nonclustered index NonClu_Index on Student(S_StuNo) with (drop_existing=on) --创建唯一索引 create unique index NonClu_Index on Student(S_StuNo) with (drop_existing=on) PS:当 create index 时,如果未指定 clustered 和 nonclustered,那么默认为 nonclustered。 创建非聚集复合索引: --创建...
第三中创建索引的方式: 使用CREATE INDEX语句创建索引 CREATE[UNIQUE] [ CLUSTERED | NONCLUSTERED ] INDEX索引名 ON{表名|视图名} (列名[ASC|DESC] [ ,...n ] ) 参数解析: UNIQUE:在表上创建唯一索引。唯一索引是不允许其中任意两行具有相同索引值的索引。 NONCLUSTERED:创建指定表的逻辑排序的索引。使用非...
sql server创建索引 创建索引的语法为: CREATE [UNIQUE] [CLUSTERED|NONCLUSTERED]INDEX 索引名 ON {表名|视图名}(字段名[ASC|DESC][,...n ]) 其中,各参数的说明如下: UNIQUE:用于指定为表或视图创建唯一索引。 CLUSTERED:用于指定创建的索引为聚集索引。
When you create a PRIMARY KEY constraint, a unique clustered index on the column or columns is automatically created if a clustered index on the table does not already exist and you do not specify a unique nonclustered index. The primary key column cannot allow NULL values. ...
CREATE CLUSTERED INDEX index1 ON database1.schema1.table1 (column1); 使用唯一约束创建非聚集索引并指定排序顺序 SQL 复制 CREATE UNIQUE INDEX index1 ON schema1.table1 (column1 DESC, column2 ASC, column3 DESC); 主要方案: 从Azure SQL 数据库和 Azure SQL 托管实例中的 SQL Server 2016(13...
GO-- Create a new table with three columns.CREATETABLEdbo.TestTable ( TestCol1INTNOTNULL, TestCol2NCHAR(10)NULL, TestCol3NVARCHAR(50)NULL); GO-- Create a clustered index called IX_TestTable_TestCol1-- on the dbo.TestTable table using the TestCol1 column.CREATECLUSTEREDINDEXIX_TestTable...
A unique nonclustered index can contain included nonkey columns. For more information, see Create an index with included columns. Security Permissions Requires ALTER permission on the table or view. User must be a member of the sysadmin fixed server role or the db_ddladmin and db_owner fixed ...
When you create a UNIQUE constraint, a unique nonclustered index is created to enforce a UNIQUE constraint by default. You can specify a unique clustered index if a clustered index on the table does not already exist. For more information, seeUnique Constraints and Check ConstraintsandPrimary and...