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.
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
- table_schema - schema name
- table_name - table name
- constraint_name - primary key constraint name
- key_columns - list of PK columns separated with ','
- One row represents one table in a database
- Scope of rows: all tables in a database
- Ordered by schema name, table name
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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