drop table t_lxh begin tran select * into t_lxh from chineseresume where name = 'XYZ' --commit 在另一个连接中Select * from sysobjects可以看到 Select INTO 会锁住系统表,Create table 也会锁系统表(不管是临时表还是系统表)。所以千万不要在事物内使用它!!!这样的话如果是经常要用的临时表请使用实...
Docker2017|2019|2022 You can also run SQL Server on Linux in an Azure virtual machine. For more information, seeProvision a SQL VM in Azure. After installing, consider making extra configuration changes for optimal performance. For more information, seePerformance best practices and configuration gu...
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...
/SourceConnectionString: /scs: {string} 指定對來源資料庫有效的 SQL Server/Azure 連接字串。 如果指定了此參數,就應該以獨佔方式將其用於所有其他來源參數。 /SourceDatabaseName: /sdn: {string} 定義來源資料庫的名稱。 /SourceEncryptConnection: /sec: {Optional|Mandatory|Strict|True|False} 指定SQL 加密...
Up to SQL Server 2017 (14.x), rebuilding a clustered columnstore index is an offline operation. The Database Engine has to acquire an exclusive lock on the table or partition while the rebuild occurs. The data is offline and unavailable during the rebuild even when usingNOLOCK,...
T-SQL Multistatement Table-valued Function Function is a convenient way to decompose program logic and reduce a code complexity. However, T-SQL functions in SQL Server may lead to some problems with the performance. There are three types of T-SQL functions in SQL Server (excluding In-Memory ...
For more information, seeWITH common_table_expression. NO_PERFORMANCE_SPOOL Applies to: SQL Server (starting with SQL Server 2016 (13.x)) and Azure SQL Database. Prevents a spool operator from being added to query plans (excep...
Table variable deferred compilation solves the 1 row estimate problem APPROX_COUNT_DISTINCT when you only need an approximate count Scheduler worker migration - balance CPU usage for long running tasks Go fast with SQL Server 2017 and 2016 performance ...
@ return_variable can be specified only for Transact-SQL functions and not for CLR functions. select_stmt The single SELECT statement that defines the return value of an inline table-valued function (TVF). ORDER (<order_clause>) Specifies the order in which results are being returned from ...
Up to SQL Server 2017 (14.x), rebuilding a clustered columnstore index is an offline operation. The Database Engine has to acquire an exclusive lock on the table or partition while the rebuild occurs. The data is offline and unavailable during the rebuild even when using NOLOCK, read-commit...