Query below lists tables and their primary key (PK) constraint names. By browsing 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,
       tab.table_name,
       tco.constraint_name,
       string_agg(kcu.column_name, ', ') as key_columns
from information_schema.tables tab
left join information_schema.table_constraints tco
          on tco.table_schema = tab.table_schema
          and tco.table_name = tab.table_name
          and tco.constraint_type = 'PRIMARY KEY'
left join information_schema.key_column_usage kcu 
          on kcu.constraint_name = tco.constraint_name
          and kcu.constraint_schema = tco.constraint_schema
          and kcu.constraint_name = tco.constraint_name
where tab.table_schema not in ('pg_catalog', 'information_schema')
      and tab.table_type = 'BASE TABLE'
group by tab.table_schema,
         tab.table_name,
         tco.constraint_name
order by tab.table_schema,
         tab.table_name

Columns

• table_schema - schema name
• table_name - table name
• constraint_name - primary key constraint name
• key_columns - list of PK columns separated with ','

Rows

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

Sample results

You can see what are the names of PK constraints for each table and which tables don't have PKs at all.

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