Query to check whether a column is nullable

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.

Solution 1:

You could retrieve that from sys.columns:

select  is_nullable 
from    sys.columns 
where   object_id = object_id('Schema.TheTable') 
        and name = 'TheColumn'

You could also use the COLUMNPROPERTY and OBJECT_ID metadata functions:

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