Sql Server关于create index include带有包含列的索引 By including nonkey columns, you can create nonclustered indexes that cover more queries. This is because the nonkey columns have the following benefits: They can be
Include nonkey columns in a nonclustered index to avoid exceeding the current index size limitations of a maximum of 32 key columns and a maximum index key size of 1,700 bytes (16 key columns and 900 bytes prior to SQL Server 2016 (13.x)). The Database Engine doesn't consider nonkey...
IFEXISTS(SELECT1FROMsys.indexesWHEREname='FK_ProductID_ModifiedDate'ANDOBJECT_ID=OBJECT_ID('Sales.SalesOrderDetail') )DROPINDEXSales.SalesOrderDetail.FK_ProductID_ModifiedDate ;GO--RUN 1: Execute Listing 5.2 here (no non-clustered index)CREATENONCLUSTEREDINDEXFK_ProductID_ModifiedDateONSales.SalesOrd...
CLUSTERED: 建立聚集索引。 NONCLUSTERED: 建立非聚集索引。 Index_property: 索引属性。 UNIQUE索引既可以采用聚集索引结构,也可以采用非聚集索引的结构,如果不指明采用的索引结构,则SQL Server系统默认为采用非聚集索引结构。 1.42 删除索引语法: DROP INDEX table_name.index_name[,table_name.index_name] 说明:tabl...
SQL Server 的語法: syntaxsql 複製 -- 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 } [ WITH ( <with_option> [ , ...n ] ) ] [ ORDER (...
In previous versions of SQL Server, when a clustered columnstore index includes any columns with LOB data types such asvarchar(max),nvarchar(max),varbinary(max), the data pages used by these columns can't be moved by the shrink operations. As the result, shrink might be less effective in ...
Computed columns derived fromimage,ntext, andtextdata types can be nonkey (included) columns in a nonclustered index as long as the computed column data type is allowable as a nonkey index column. SET option requirements TheANSI_NULLSconnection-level option must be set toONwhen theCREATE TABLE...
FK_ProductID_ModifiedDate ; GO --RUN 1: Execute Listing 5.2 here (no non-clustered index) CREATE NONCLUSTERED INDEX FK_ProductID_ModifiedDate ON Sales.SalesOrderDetail (ProductID, ModifiedDate) ; --RUN 2: Re-execute Listing 5.2 here (non-clustered index with no include) IF EXISTS ( ...
create nonclustered index idx_count on deadlock_test(view_count) where view_count>50; -- 有效利用筛选索引 select id from deadlock_test where view_count>60 -- 无法有效利用筛选索引 select id from deadlock_test where view_count<30 1. ...
1: CREATE UNIQUE CLUSTERED INDEX IX1 ON Test_Table(Col1); 2: 3: CREATE INDEX IX2 ON Test_Table(Col1); 2) 在非主键列上创建不同顺序的包含列的索引 代码语言:javascript 代码运行次数:0 运行 AI代码解释 1: CREATE INDEX IX3 ON Test_Table (Col4) 2: INCLUDE (Col2, Col3); 3: 4: CR...