You cannot create a non-clustered index on a table variable, unless the index is a side effect of a PRIMARY KEY or UNIQUE constraint on the table (SQL Server enforces any UNIQUE or PRIMARY KEY constraints using an index). Also, SQL Server does not maintain statistics on a table variable,...
)CREATENONCLUSTEREDINDEXIX_#1_NrON#1(NrASC)GOSELECTB.NAMEASTABLENAME , A.object_id, a.name , a.index_id , a.typeFROMSYS.indexesASAINNERJOINSYS.TABLESASBONA.OBJECT_ID=B.OBJECT_IDWHEREB.NAMELIKE'#1[_]%'ORDERBYB.CREATE_DATEASC/*从返回的结果,我们看到在系统视图表SYS.INDEXS中,创建有两个...
DECLARE @local_variable (Transact-SQL)可以使用所有内存中 OLTP 支持的数据类型以及内存优化表类型。 可将变量声明为 NULL 或 NOT NULL。 SET @local_variable (Transact-SQL) TRY...CATCH (Transact-SQL) 要优化性能,请对整个本机编译的 T-SQL 模块使用单个 TRY/CATCH ...
syntaxsql 複製 FROM { <table_source> [ , ...n ] } <table_source> ::= { [ database_name . [ schema_name ] . | schema_name . ] table_or_view_name [ AS ] table_or_view_alias [ <tablesample_clause> ] | derived_table [ AS ] table_alias [ ( column_alias [ , ...n ]...
The following table lists the Transact-SQL features and keywords that can appear in the message text of an error involving a nonclustered hash index, as well as the corrective action to resolve the error. TypeNameResolution OptionASC/DESCNonclustered hash indexes are not ordered. Remove the keywo...
[AS]table_alias] |OPENXML<openxml_clause>|derived_table[ [AS]table_alias] [ (column_alias[ , ...n ] ) ] |<joined_table>|<pivoted_table>|<unpivoted_table>| @variable [ [AS]table_alias] | @variable.function_call( expression [ , ...n ] ) [ [AS]table_alias] [ (column_...
Clustered columnstore index: Data Load Optimization - Parallel Bulk Import Features of In-Memory OLTP Let's look at the main features of In-Memory OLTP. Memory-optimized tables The T-SQL keyword MEMORY_OPTIMIZED, on the CREATE TABLE statement, is how a table is created to exist in active me...
SqlServer.TransactSql.ScriptDom AddAlterFullTextIndexAction 類別 AddFileSpec 類別 AddMemberAlterRoleAction 類別 AddSearchPropertyListAction 類別 AddSignatureStatement 類別 AdHocDataSource 類別 AdHocTableReference 類別 AffinityKind 列舉 AlgorithmKeyOption 類別 AllowConnectionsOptionKind 列舉 AlterAction 列舉 Alter...
Similar to SQL Server, you can use the PostgreSQL EXECUTE command with bind variables. Converting SQL Server dynamic SQL to PostgreSQL requires significant efforts. Examples The following example runs a SQL SELECT query with the table name as a dynamic variable using bind...
Also, if the table is tiny (say, a couple of pages), the alternatives are 1) using a table variable resulting in complete scans and few or no recompilations; or 2) using a temporary table resulting in index seeks and more recompilations. The advantage of seeks versus scans may be outwe...