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Tip of the Day
Language: SQL
Expertise: Intermediate
Aug 3, 2017

Identifying Tables Without Primary Keys in SQL

It is quite easy to find out which tables in your database(s) do not have Primary Keys. You can use the following SQL script:

SELECT s.name + N'.' + t.name [table]
  FROM sys.tables AS t
  INNER JOIN sys.schemas AS s
  ON t.[schema_id] = s.[schema_id]
  WHERE NOT EXISTS
  (
    SELECT 1 FROM sys.key_constraints AS k
      WHERE k.[type] = N'PK'
      AND k.parent_object_id = t.[object_id]
  ) 
Hannes du Preez
 
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