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Sonya Curry

Finding Tables with no Primary Keys
by Sonya Curry

You’ll want to know if there tables without primary keys and why. Here is a way of getting that information from the INFORMATION_SCHEMA.tables view.

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--Which of my tables don't have primary keys?
SELECT --we'll do it via information_Schema
                        +TheTables.Table_Name AS [tables without primary keys]
  information_Schema.tables TheTables
  LEFT OUTER JOIN information_Schema.table_constraints TheConstraints
    ON TheTables.table_Schema=TheConstraints.table_schema
       AND TheTables.table_name=TheConstraints.table_name
       AND constraint_type='PRIMARY KEY'
  AND constraint_name IS NULL
  ORDER BY [tables without primary keys];

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