Goal Find non-function based indexes (both unique and non-unique) that have identical first column but the operator class that is used in case of the first column is different. Include unique indexes that support a constraint (primary key, unique, exclude), i.e., these indexes have been automatically created due to the constraint declaration.
Type General (Overview of some aspect of the database.)
License MIT License
Data Source system catalog only
SQL Query
WITH indexes AS (SELECT 
  n.nspname AS sch,
  c2.relname AS tbl,
  c.relname AS indx,    
  array_agg(a.attname ORDER BY a.attnum) AS clm,
  i.indisunique,
  indclass[0] AS operator_class,
  pg_get_indexdef(c.oid) AS index_def,
  EXISTS (SELECT * FROM pg_catalog.pg_constraint AS o WHERE o.conindid=i.indexrelid) AS is_constraint
FROM 
  pg_catalog.pg_class AS c INNER JOIN pg_catalog.pg_index AS i ON i.indexrelid = c.oid
  INNER JOIN pg_catalog.pg_class AS c2  ON i.indrelid = c2.oid
  INNER JOIN pg_catalog.pg_namespace AS n ON c.relnamespace = n.oid
  INNER JOIN pg_catalog.pg_authid AS u ON  n.nspowner = u.oid
  INNER JOIN pg_catalog.pg_attribute AS a ON a.attrelid = c.oid    
WHERE c.relkind = 'i'
AND i.indexprs IS NULL
AND a.attnum>=1
AND a.attisdropped = FALSE
AND (n.nspname = 'public'
	 OR u.rolname <> 'postgres')
GROUP BY n.nspname, c2.relname, c.relname, i.indisunique, indclass[0], index_def, is_constraint),
index_with_type AS (SELECT sch, tbl, indx, clm, operator_class, index_def,
CASE WHEN is_constraint=TRUE THEN 'UNIQUE CONSTRAINT INDEX'
WHEN indisunique=TRUE AND is_constraint=FALSE THEN 'UNIQUE NON-CONSTRAINT INDEX' 
ELSE 'NON-UNIQUE INDEX' END AS index_type
FROM indexes)
SELECT A.sch AS table_schema, A.tbl AS table_name, A.index_type AS idx1_index_type, A.indx AS idx1, A.index_def AS idx1_def,
B.index_def AS idx2_def, B.index_type AS idx2_index_type, B.indx AS idx2
FROM index_with_type AS A, index_with_type AS B
WHERE A.sch=B.sch AND A.tbl=B.tbl AND A.indx>B.indx AND A.clm[1]=B.clm[1] AND A.operator_class<>B.operator_class
ORDER BY A.sch, A.tbl, A.indx, B.indx;

Collections

This query belongs to the following collections:

NameDescription
Find problems by overviewQueries that results point to different aspects of database that might have problems. A human reviewer has to decide based on the results as to whether there are problems or not .
Categories

This query is classified under the following categories:

NameDescription
PerformanceQueries of this category provide information about indexes in a database.