查询以检查列是否可为空

查询以检查列是否可为空

问题描述:

查询一列是否可以为空(列中是否允许空值).它最好应该返回 yes/no 或 1/0 或 true/false.

Query to check whether a column is nullable (null values are allowed in the column or not). It should preferably return yes/no or 1/0 or true/false.

您也可以使用 COLUMNPROPERTYOBJECT_ID 元数据函数:

You could also use the COLUMNPROPERTY and OBJECT_ID metadata functions:

SELECT COLUMNPROPERTY(OBJECT_ID('SchemaName.TableName', 'U'), 'ColumnName', 'AllowsNull');