The query below lists all unique indexes in the database (schema).

Check out also list of unique constraints.

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Query

select index_schema,
       index_name,
       group_concat(column_name order by seq_in_index) as index_columns,
       index_type,
       table_name
from information_schema.statistics
where table_schema not in ('information_schema', 'mysql',
                           'performance_schema', 'sys')
                   and non_unique = 0
group by index_schema,
         index_name,
         index_type,
         table_name
order by index_schema,
         index_name;

Columns

• index_schema - index schema (database)
• index_name - name of the index
• index_columns - list of index columns separated by ","
• index_type
  • BTREE
  • RTREE
  • FULLTEXT
  • HASH
  • SPATIAL
• table_name - name of the table

Rows

• One row: represents one unique index
• Scope of rows: all unique indexes in the database (schema)
• Ordered by: index schema and index name

Sample results

Unique indexes in the Sakila database (schema):