How to list out all Foreign Keys with “WITH NOCHECK” in SQL Server

Question

Does anyone know a query for listing out all foreign keys in a database with WITH NOCHECK description applied to it? (removing them will boost performance and

Answer 1

The following script will generate the alter statements that will both check existing data and prevent any new violations for foreign keys that are not currently trusted ('with nocheck').

Execute it in SQL Server Management Studio to generate the scripts and then copy them into a query window to execute them.

select
    'alter table ' + quotename(s.name) + '.' + quotename(t.name) + ' with check check constraint ' + fk.name +';'
from 
    sys.foreign_keys fk
inner join
    sys.tables t
on
    fk.parent_object_id = t.object_id
inner join
    sys.schemas s
on
    t.schema_id = s.schema_id
where 
    fk.is_not_trusted = 1