List tables with their primary keys (PKs) in PostgreSQL database

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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