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Select the primary key for a table

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  1. SELECT k.column_name
  2. FROM information_schema.table_constraints t
  3. JOIN information_schema.key_column_usage k
  4. USING(constraint_name,table_schema,TABLE_NAME)
  5. WHERE t.constraint_type='PRIMARY KEY'
  6.   AND t.table_schema='db'
  7.   AND t.table_name='tbl';

URL: http://lists.mysql.com/mysql/204944

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