Query below lists tables in a database without primary keys.

Query

select schema_name(tab.schema_id) as [schema_name], 
    tab.[name] as table_name
from sys.tables tab
    left outer join sys.indexes pk
        on tab.object_id = pk.object_id 
        and pk.is_primary_key = 1
where pk.object_id is null
order by schema_name(tab.schema_id),
    tab.[name]

Columns

• schema_name - schema name
• table_name - table name

Rows

• One row represents one table in a database
• Scope of rows: all tables without primary keys in a database
• Ordered by schema, table name

Sample results

Below is a list of tables in Microsoft System Center Configuration Manager database without primary keys. Is that a lot? Check out here.