ALTERTABLEtable_nameALTERCOLUMNcolumn_name [type_name] [NULL|NOTNULL] [COLLATEcollation_name] example: This example demonstrates how to change an existing table column’s nullability and data type.The Gender column in the HumanResources.Employeetable is originally NOT NULL and the original data typ...
You can specify whether a table should be compressed when creating the table. 你在创建表时,可以指定一个表是否需要压缩。 You can use ALTER TABLE to change most properties of columns after a table has been created. 你在创建表之后,可用ALTER TABLE来修改大多数列的属性。 Lession Review 本课复习 ...
禁用全文索引时,如果 CHANGE_TRACKING 处于启用状态(自动或手动更新),则索引状态将冻结,任何正在进行的爬网将停止,并且不会跟踪对表数据进行的新更改,也不会将这些更改传播到索引。可以使用 ENABLE 重新激活对table_name的全文索引。 SET CHANGE_TRACKING {MANUAL | AUTO | OFF} 指定SQL Server 是否维护一份对索引数...
ALTERTABLEtable_nameALTERCOLUMNcolumn_name [type_name] [NULL|NOTNULL] [COLLATEcollation_name] example: This example demonstrates how to change an existing table column’s nullability and data type.The Gender column in the HumanResources.Employeetable is originally NOT NULL and the original data typ...
Perform a conditional two-way synchronization using NULL for no change andDELETEfrom the target when the data isn’t found in the source. TRUNCATE TABLE SourceTable; INSERT INTO SourceTable (Col1, Col2) VALUES (3, NULL), (4, 'NewSource4'), (5, 'Source5'...
SQL Server 2016 (13.x): ALTER TABLE and ALTER PROCEDURE operations are supported. Other schema changes, including sp_rename, are not supported.SQL Server 2014 (12.x): schema changes are not supported. To change the definition of a memory-optimized table or natively compiled stored procedure,...
此存储过程删除 SQL Server 发布服务器实例上的发布数据库上或 SQL Server 订阅实例上的订阅数据库上的所有复制对象。 在相应的数据库中执行sp_removedbreplication,或者,如果执行位于同一实例上的另一个数据库的上下文中,请指定应删除复制对象的数据库。 此过程不会从其他数据库(如分发数据库)中删除对...
SQL Server 2016 (13.x): ALTER TABLE and ALTER PROCEDURE operations are supported. Other schema changes, including sp_rename, are not supported.SQL Server 2014 (12.x): schema changes are not supported. To change the definition of a memory-optimized table or natively compiled stored procedure,...
EXEC sys.xp_sprintf @ret_string OUTPUT, '@@columnName = %s has unrecoginzed @dataType = %s', @columnName, @dataType; RAISERROR(@ret_string,16,1); RETURN; END; END; ELSE BEGIN /* legal data types, don't change datatype but capture correct columnLength */ -- VALUES ('nvarchar'...
In this lesson, you remove access to data, delete data from a table, delete the table, and then delete the database. Requirements To complete this tutorial, you don't have to know the SQL language, but you should understand basic database concepts such as tables. During this tutorial, yo...