Query below lists table (and view) indexes. Query selectschema_name(t.schema_id) +'.'+ t.[name]astable_view,casewhent.[type] ='U'then'Table'whent.[type] ='V'then'View'endas[object_type], i.index_id,casewheni.is_primary_key =1then'Primary key'wheni.is_unique =1then'Unique'...
ALTER INDEX [<index-name>] on [<table-name>] REORGANIZE with (COMPRESS_ALL_ROW_GROUPS = ON) 加载到已分区表的工作原理 对于分区数据,数据库引擎首先将每一行分配给分区,然后对分区中的数据执行列存储作。 每个分区都具有自己的行组以及至少一个增量行组。 相关内容 使用聚集列存储索...
CREATE PRIMARY KEY INDEX index_name ON table_name (column_name) ;---主键索引 使用ALTER TABLE语句创建索引 alter table table_name add index index_name (column_list) ; alter table table_name add unique (column_list) ; alter table table_name add primary key (column_list) ; 2.删除索引 drop...
DROPINDEX [IFEXISTS] index_name ONtable_name; 删除不存在的索引会报错。但是,可以使用IF EXISTS有条件地删除索引并避免报错。 请注意,IF EXISTS只在SQL Server 2016(13.x)以后的版本可用。 DROP INDEX不会删除由PRIMARY KEY或UNIQUE约束创建的索引。要删除与这些约束关联的索引,可以使用ALTER TABLE DROP CONSTRAI...
Create indexes The GetLevel() method can be used to create a breadth first ordering. In the following example, both breadth-first and depth-first indexes are created: SQL Kopéieren USE AdventureWorks2022; GO CREATE TABLE Organization ( BusinessEntityID HIERARCHYID, OrgLevel AS BusinessEntityID....
4. select @@servername 5. select serverproperty('servername') 6. 7. --如果不一致,执行下面的语句 8. if serverproperty('servername') <> @@servername 9. begin 10. declare @server sysname 11. set @server = @@servername 12. exec sp_dropserver @server = @server ...
CREATE TABLE Users ( UserID INT IDENTITY, UserName nvarchar(50), Age INT, Gender BIT, CreateTime DateTime ) --在UserID列上创建聚集索引 IX_UserID CREATE UNIQUE CLUSTERED INDEX IX_UserID ON dbo.Users(UserID) --插入示例数据 insert into Users(UserName,Age,Gender,CreateTime) ...
Indexes on tables and views can be disabled. When a clustered index on a table is disabled, indexes on views associated with the table are also disabled. Permissions To create the view, a user needs to hold the CREATE VIEW permission in the database and ALTER permission on the schema in ...
Create indexes on persisted computed columns Sometimes you can create a computed column that is defined with an expression that is deterministic yet imprecise. You can do this when the column is markedPERSISTEDin theCREATE TABLEorALTER TABLEstatement. ...
ALTERTABLEdbo.T1ADDIntProdIDASCONVERT(INT, ProdID);CREATEINDEXIndProdID_intONdbo.T1 (IntProdID); 在某些情况下,无法轻松地重写查询以允许 SARGability。 在那些情况下,请查看带有索引的计算列是否可提供帮助,或者保持查询原样,并意识到它可能使 CPU 使用率更高。