The query below lists the tables and their primary key (PK) constraint names in all user databases. By browsing the list, you can spot which tables have and which don't have primary keys.

See also: tables without primary keys.

Query

select tab.table_schema as database_name,
       tab.table_name,
       tco.constraint_name as pk_name,
       group_concat(kcu.column_name
            order by kcu.ordinal_position
            separator ', ') as columns
from information_schema.tables tab
left join information_schema.table_constraints tco
          on tab.table_schema = tco.table_schema
          and tab.table_name = tco.table_name
          and tco.constraint_type = 'PRIMARY KEY'
left join information_schema.key_column_usage kcu
          on tco.constraint_schema = kcu.constraint_schema
          and tco.constraint_name = kcu.constraint_name
          and tco.table_name = kcu.table_name
where tab.table_schema not in ('mysql', 'information_schema')
group by tab.table_schema,
         tab.table_name,
         tco.constraint_name
order by tab.table_schema,
         tab.table_name;

Columns

• database_name - name of the database (schema)
• table_name - name of the table
• pk_name - primary key constraint name
• columns - list of PK columns separated by ','

Rows

• One row: represents one table in a database (schema)
• Scope of rows: all tables in the databases (schemas)
• Ordered by: database (schema) name, table name

Sample results

You could also get this

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