You can create clustered indexes on tables by using SQL Server Management Studio or Transact-SQL. With few exceptions, every table should have a clustered index. Besides improving query performance, a clustered index can be rebuilt or reorganized on demand to control table fragmentation. A ...
= column_set_name XML COLUMN_SET FOR ALL_SPARSE_COLUMNS <table_constraint> ::= [ CONSTRAINT constraint_name ] { { PRIMARY KEY | UNIQUE } [ CLUSTERED | NONCLUSTERED ] ( column_name [ ASC | DESC ] [ ,... n ] ) [ WITH FILLFACTOR = fillfactor | WITH ( <index_option> [ ,... ...
Create table[database.[owner].]table_name (column_name datatype [default {constant_expression|user|null}] {[{identity|null|not null}]|[[constraint constraint_name] {{unique|primary key}[clustered|nonclustered] [with{fillfactor|max_rows_per_page}=x] [on segment_name] |references[[database....
CREATE UNIQUE CLUSTERED INDEX index-name ON TABLE owner.catalog.schema.table (field1 ASC, field2 DESC) 索引名称 索引的名称在给定的表中必须是唯一的。 索引名称遵循标识符约定,受以下限制。 默认情况下,索引名是简单的标识符; 索引名称可以是分隔的标识符。 索引名不能超过128个字符。 索引名不区分大小写...
create clustered index index_name on table(column_name) 1. 2. 3. 创建非聚集索引 create nonclustered index index_name on table(column_name) 1. 2. :聚簇(或者叫做聚集,cluster)索引和非聚簇索引。 字典的拼音目录就是聚簇(cluster)索引,笔画目录就是非聚簇索引。这样查询“G到M的汉字”就非常快,而...
CREATE TABLE t_account ( accountkey int NOT NULL PRIMARY KEY NONCLUSTERED, Accountdescription nvarchar (50), accounttype nvarchar(50), unitsold int, INDEX t_account_cci CLUSTERED COLUMNSTORE ) WITH (MEMORY_OPTIMIZED = ON ); 现在,无需对应用程序进行任...
CREATEUNIQUECLUSTEREDINDEXindex-nameONTABLEowner.catalog.schema.table(field1ASC,field2DESC) 索引名称 索引的名称在给定的表中必须是唯一的。 索引名称遵循标识符约定,受以下限制。 默认情况下,索引名是简单的标识符; 索引名称可以是分隔的标识符。 索引名不能超过128个字符。 索引名不区分大小写。
= column_set_name XML COLUMN_SET FOR ALL_SPARSE_COLUMNS <table_constraint> ::= [ CONSTRAINT constraint_name ] { { PRIMARY KEY | UNIQUE } [ CLUSTERED | NONCLUSTERED ] ( column_name [ ASC | DESC ] [ ,... n ] ) [ WITH FILLFACTOR = fillfactor | WITH ( <index_option> [ ,... ...
Select OK. In the New Index dialog box, select OK.Create a clustered index by using the Table DesignerIn Object Explorer, expand the database on which you want to create a table with a clustered index. Right-click the Tables folder and select New Table... Create a new table as you...
15: CREATE TABLE [dbo].[Departments]( 16: [deptid] [int] IDENTITY(1,1) NOT NULL, 17: [deptname] [nchar](10) NULL, 18: CONSTRAINT [PK_Departments] PRIMARY KEY CLUSTERED 19: ( [deptid] ASC ) 20: WITH 21: (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, ...