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

The query below lists all primary keys constraints (PK) in a database (schema) with their columns (one row per column).

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

Query

select tab.table_schema as database_schema,
    sta.index_name as pk_name,
    sta.seq_in_index as column_id,
    sta.column_name,
    tab.table_name
from information_schema.tables as tab
inner join information_schema.statistics as sta
        on sta.table_schema = tab.table_schema
        and sta.table_name = tab.table_name
        and sta.index_name = 'primary'
where tab.table_schema = 'your database name'
    and tab.table_type = 'BASE TABLE'
order by tab.table_name,
    column_id;

Columns

  • table_schema - PK database (schema) name
  • pk_name - PK constraint name
  • column_id - id of the column in index (1, 2, ...). 2 or higher means the key is composite (contains more than one column)
  • column_name - primary key column name
  • table_name - PK table name

Rows

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

Sample results

Sample results for the Sakila database (schema)

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