Temporary Tables And Table Variables In SQL 基本常识 1. 局部临时表(#开头)只对当前连接有效,当前连接断开时自动删除 2. 全局临时表(##开头)对其它连接也有效,在当前连接和其他访问过它的连接都断开时自动删除 3. 临时表就像普通表一样,它可以做索引等等 4. 临时表存在 tempdb database, 表变量存在 memory...
转自http://www.mssqltips.com/sqlservertip/2825/sql-server-temp-table-vs-table-variable-performance-testing/ Problem If you've been a DBA for any amount of time I'm sure you've been asked the question: Which is better to use, a temp table or a table variable? There are technical rea...
Temporary Tables And Table Variables In SQL 基本常识 1. 局部临时表(#开头)只对当前连接有效,当前连接断开时自动删除 2. 全局临时表(##开头)对其它连接也有效,在当前连接和其他访问过它的连接都断开时自动删除 3. 临时表就像普通表一样,它可以做索引等等 4. 临时表存在 tempdb database, 表变量存在 memory...
Table Variables (VS) Temp Tables SQLServer2005 caches temp tables and temp variables only under some conditions. Scenarios where temp table/variable are not cached (see below) may cause performance degradation as compared to SQLServer2000. Following ...
15. Unlike a #temp table, you cannot drop a table variable when it is no longer necessary—you just need to let it go out of scope. 16. You can’t build the table variable inside dynamic SQL. This is because the rest of the script knows nothing about the temporary objects created wi...
Faster temp table and table variable by using memory optimization Article 02/23/2024 13 contributors Feedback In this article A. Basics of memory-optimized table variables B. Scenario: Replace global tempdb ##table C. Scenario: Replace session tempdb #table D. Scenario: Table variable can...
Temp tables may be a better solution in this case. For queries that join the table variable with other tables, use the RECOMPILE hint, which causes the optimizer to use the correct cardinality for the table variable. table variables aren't supported in the SQL Server optimizer's cost-based...
其实在SQL Server中存在两种临时表:局部临时表和全局临时表,局部临时表(Local temp table)以#前缀来标识,并且只能被创建它的连接所使用.全局临时表(Global temp table)以##前缀来进行标识,并且可以和其它连接所共享.局部临时表局部临时表不能够被其它连接所共享的原因其实是在SQL Server 2000中自动为局部临时表的表...
Package: Microsoft.SqlServer.TransactSql.ScriptDom v161.8901.0 This class represents the declare @variable statement's table variation. C# 复制 [System.Serializable] public class DeclareTableVariableStatement : Microsoft.SqlServer.TransactSql.ScriptDom.TSqlStatement Inheritance Object TSqlFr...
Instead of using a temp table #GroupMembers you could create a table Variable. It has the same table construct and allows you to pass the variable around. http://msdn.microsoft.com/en-us/library/ms188927.aspx Warwick Rudd MCT MCITP SQL Server 2008 Admin ...