Case Statement in Where clause with parameters SQL Server CASE statement inclusion and exclusions case statement inside a where clause with 'IN' operator CASE Statement on multiple columns CASE STATEMENT RETURN
SQL Server 数据库引擎可处理对多种数据存储体系结构(例如,本地表、已分区表以及分布在多个服务器上的表)执行的查询。 以下部分介绍了 SQL Server 如何处理查询并通过执行计划缓存来优化查询重用。执行模式SQL Server 数据库引擎可使用两种不同的处理模式处理 Transact-SQL 语句:...
SQL Server Get most common value over group by for multiple columnsThe main idea is that you ...
partitionOptions 指定用來從 SQL Server 載入資料的資料分割選項。 允許的值為:None (預設值)、PhysicalPartitionsOfTable 和DynamicRange。啟用分割選項後 (亦即不是 None),從 SQL Server 同時載入資料的平行程度,由複製活動的 parallelCopies 設定所控制。 No partitionSettings 指定資料分割的設定群組。 當分割選項不...
Database compatibility level is a valuable tool to help with database modernization by allowing the SQL Server Database Engine to be upgraded while keeping the same functional status for connecting applications by maintaining the same pre-upgrade database compatibility level. This means that it's po...
5 Support for columns of type hierarchyid depends on the type of replication and the versions of SQL Server that are used. For more information, see the "Using hierarchyid Columns in Replicated Tables" section of hierarchyid (Transact-SQL). For merge replication, hierarchyid is mapped to image ...
directly access the underlying tables of the query. Views can be used to provide a backward compatible interface to emulate a table that used to exist but whose schema has changed. Views can also be used when you copy data to and from SQL Server to improve performance and to partition data...
Issue 2: Fixes SQL Server error 942 that occurs when you perform the following steps in the same sequence on your SQL Server instance: 1. You query a table in a database (for example: SELECT * FROM DatabaseA.sys.columns). 2. You rename an existing database (for example:...
If ORDER BY contains multiple order expressions, CURRENT ROW FOR RANGE considers all columns in the ORDER BY list when determining the current row. UNBOUNDED PRECEDING Applies to: SQL Server 2012 (11.x) and later versions. Specifies that the window starts at the first row of the partition. ...
Unless performed at the time of partition creation, the default alignment offset will result in unaligned partitions on versions of Windows up to and including Windows Server 2003. These versions of Windows create disk partitions by default to boundaries based on the Cylinder/Head/Sector (CHS) addr...