List all primary keys (PKs) in a database

The query below lists all primary keys constraints (PK) in the database.

See also: tables with their primary keys.

Query

select schema_name(tab.schema_id) as [schema_name],
    pk.[name] as pk_name,
    substring(column_names, 1, len(column_names)-1) as [columns],
    tab.[name] as table_name
from sys.tables as tab
    inner join sys.indexes as pk
        on tab.object_id = pk.object_id
        and pk.is_primary_key = 1
    cross apply (select col.[name] + ', '
                from sys.index_columns as ic
                    inner join sys.columns as col
                        on ic.object_id = col.object_id
                        and ic.column_id = col.column_id
                where ic.object_id = tab.object_id
                        and ic.index_id = pk.index_id
                order by col.column_id
                    for xml path ('') ) D (column_names)
order by schema_name(tab.schema_id),
    pk.[name]

Columns

  • schema_name - PK schema name
  • pk_name - PK constraint name
  • columns - list of PK columns separated with ','
  • table_name - PK table name

Rows

  • One row: represents one primary key (table) in a database
  • Scope of rows: all PK constraints in a database
  • Ordered by: schema, PK constraint name

Sample results

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