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...
(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...
| 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 | { ...
ALTER TABLE products ADD COLUMN description text;新增的字段对于表中已经存在的行而言最初将先填充所给出的缺省值(如果你没有声明DEFAULT子句,那么缺省是空值)。 增加列(含约束) ALTER TABLE products ADD COLUMN description text CHECK (description <>''); 删除列 alter table 表名 drop column 列名 删除列(...
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...
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 +...
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...
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 =...
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