Question

By constraints I mean checks, not nulls, primary key constraint, foreign key constraint

What SQL query to use

Visual Studio 2008 / SQL Server 2005 Express

Like for example to get table names

commandString = "SELECT * FROM INFORMATION_SCHEMA.TABLES";

So what to get constraints.

Answer 1

You can use the sys.objects table to get this info, check this query to get all Constraints of an table .

SELECT OBJECT_NAME(OBJECT_ID) AS [Constraint],SCHEMA_NAME(schema_id) AS [Schema],
OBJECT_NAME(parent_object_id) AS [Table],
type_desc AS [Type] FROM sys.objects 
WHERE 1=1  
AND OBJECT_NAME(parent_object_id)='YOURTABLENAME'
AND type_desc LIKE '%CONSTRAINT'