List all primary keys (PKs) and their columns in PostgreSQL database

Query below lists all primary keys constraints (PK) in the database with their columns (one row per column).

See also: list of all primary keys (one row per PK).

Query

select kcu.table_schema,
       kcu.table_name,
       tco.constraint_name,
       kcu.ordinal_position as position,
       kcu.column_name as key_column
from information_schema.table_constraints tco
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 tco.constraint_type = 'PRIMARY KEY'
order by kcu.table_schema,
         kcu.table_name,
         position;

Columns

  • table_schema - PK schema name
  • table_name - PK table name
  • constraint_name - PK constraint name
  • position - index of column in table (1, 2, ...). 2 or higher means key is composite (contains more than one column)
  • key_column - PK column name

Rows

  • One row represents one primary key column
  • Scope of rows: columns of all PK constraints in a database
  • Ordered by table schema, table name, column position

Sample results

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