Try to change a value in the description column to NULL. This fails. 尝试把这一行的description列设置为空值。结果失败了。 SQLUPDATE Production.CategoriesTest SET description = NULL WHERE categoryid = 8; GO Alter the table and make the description column allow NULL. 修改表,使description允许为空...
HOST_NAME() --函数返回服务器端计算机的名称 IDENTITY(<data_type>[, seed increment]) [AS column_name]) --IDENTITY() 函数只在SELECT INTO 语句中使用用于插入一个identity column列到新表中 /*select identity(int, 1, 1) as column_name into newtable from oldtable*/ ISDATE() --函数判断所给定...
| SET CHANGE_TRACKING { MANUAL | AUTO | OFF } | ADD ( column_name [ TYPE COLUMN type_column_name ] [ LANGUAGE language_term ] [,...n] ) [ WITH NO POPULATION ] | DROP ( column_name [,...n] ) [WITH NO POPULATION ] | START { FULL | INCREMENTAL | UPDATE } POPULATION | { ...
sp_change_agent_parameter sp_change_agent_profile sp_changearticle sp_changearticlecolumndatatype sp_changedistpublisher sp_changedistributiondb sp_changedistributor_password sp_changedistributor_property sp_changedynamicsnapshot_job sp_changelogreader_agent sp_changemergearticle sp_changemerge...
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...
One of my colleagues was asked me about problem finding incorrect data but their problem is this column is Char type and find incorrect rows by date type. Solution For example, have one table: CREATE TABLE #test (c1 char(8) NULL) INSERT #test VALUES ('20150131...
INFORMATION_SCHEMA.COLUMNS 视图的 ORDINAL_POSITION 列与COLUMNS_UPDATED所返回列的位模式不兼容。 若要获取与COLUMNS_UPDATED兼容的位模式,请在查询INFORMATION_SCHEMA.COLUMNS视图时引用COLUMNPROPERTY系统函数的ColumnID属性,如以下示例所示。 SQL SELECTTABLE_NAME, COLUMN_NAME, COLUMNPROPERTY(OBJECT_ID(TABLE_SCHEMA +...
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'...
sp_MSchange_distribution_agent_properties[ @publisher = ]N'publisher', [ @publisher_db= ]N'publisher_db', [ @publication = ]N'publication', [ @subscriber = ]N'subscriber', [ @subscriber_db= ]N'subscriber_db', [ @property = ]N'property', [ @value =...
(9 rows affected) 1> 2> ALTER TABLE Employee 3> ALTER COLUMN Name varchar (30) NOT NULL 4> GO 1> 2> select * from employee 3> GO ID name salary start_date city region --- --- --- --- --- --- 1 Jason 40420 1994-02-01 00:00:00.000 New York W 2 Robert 14420 1995-01...