The list of all the queries

Empty schemas

Query goal: Find schemas without schema objects.
Query type: Problem detection (Each row in the result could represent a flaw in the design)
Query reliability: High (Few or no false-positive results)
Query license: MIT License
Fixing suggestion: Drop the unused schemas or add schema elements to these.
Data source: INFORMATION_SCHEMA+system catalog
SQL query: Click on query to copy it

WITH schemas_with_objects AS (
SELECT 
n.nspname AS schema_name
FROM pg_namespace AS n INNER JOIN pg_authid AS a ON n.nspowner=a.oid
INNER JOIN pg_class AS c ON n.oid=c.relnamespace
WHERE (n.nspname='public' OR a.rolname<>'postgres')
AND relkind NOT IN ('t')
UNION SELECT 
n.nspname AS schema_name
FROM pg_namespace AS n INNER JOIN pg_authid AS a ON n.nspowner=a.oid
INNER JOIN pg_type AS pt ON n.oid=pt.typnamespace
WHERE (n.nspname='public' OR a.rolname<>'postgres')
AND pt.typtype NOT IN ('b','c')
UNION SELECT 
n.nspname AS schema_name
FROM pg_namespace AS n INNER JOIN pg_authid AS a ON n.nspowner=a.oid
INNER JOIN pg_proc AS pc ON n.oid=pc.pronamespace
WHERE (nspname='public' OR rolname<>'postgres')),
all_user_schemas AS (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name='public'
OR schema_owner<>'postgres')
SELECT schema_name
FROM all_user_schemas
EXCEPT SELECT schema_name
FROM schemas_with_objects
ORDER BY schema_name;

SQL statements for generating SQL statements that help us to fix the problem

SQL queryDescription
WITH schemas_with_objects AS (
SELECT 
n.nspname AS schema_name
FROM pg_namespace AS n INNER JOIN pg_authid AS a ON n.nspowner=a.oid
INNER JOIN pg_class AS c ON n.oid=c.relnamespace
WHERE (n.nspname='public' OR a.rolname<>'postgres')
AND relkind NOT IN ('t')
UNION SELECT 
n.nspname AS schema_name
FROM pg_namespace AS n INNER JOIN pg_authid AS a ON n.nspowner=a.oid
INNER JOIN pg_type AS pt ON n.oid=pt.typnamespace
WHERE (n.nspname='public' OR a.rolname<>'postgres')
AND pt.typtype NOT IN ('b','c')
UNION SELECT 
n.nspname AS schema_name
FROM pg_namespace AS n INNER JOIN pg_authid AS a ON n.nspowner=a.oid
INNER JOIN pg_proc AS pc ON n.oid=pc.pronamespace
WHERE (nspname='public' OR rolname<>'postgres')),
all_user_schemas AS (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name='public'
OR schema_owner<>'postgres')
SELECT format('DROP SCHEMA %1$I;', schema_name) AS statements
FROM all_user_schemas
WHERE NOT EXISTS (SELECT *
FROM schemas_with_objects
WHERE all_user_schemas.schema_name=schemas_with_objects.schema_name)
ORDER BY statements;
Drop the schemas.

Collections where the query belongs to

Collection nameCollection description
Find problems automaticallyQueries, that results point to problems in the database. Each query in the collection produces an initial assessment. However, a human reviewer has the final say as to whether there is a problem or not .

Categories where the query belongs to

Category nameCategory description
SchemasQueries of this category provide information about databse schemas
Unused implementation elementsQueries of this catergory provide information about the database objects that are not used.

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