Names of the columns of derived tables that have been given by the system

Query goal:

Find columns of derived tables that name has been given by the system. The creators of the table should specify the name themselves to avoid ugly names and nasty surprises.

Notes about the query:

pg_get_viewdef function reconstructs the underlying SELECT command for a view or materialized view. Thus, this is a decompiled reconstruction, not the original text of the command.

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:

Give to the columns explicitly names in the table definition.

Data source:

INFORMATION_SCHEMA+system catalog

SQL query:

Click on query to copy it

WITH columns AS (SELECT nspname AS table_schema, relname AS table_name, 
CASE WHEN relkind='m' THEN 'MATERIALIZED VIEW' ELSE 'VIEW' END AS table_type, attname AS column_name,
pg_get_viewdef(pg_class.oid) AS viewdef
FROM pg_class INNER JOIN pg_namespace ON pg_class.relnamespace=pg_namespace.oid
INNER JOIN pg_attribute ON pg_class.oid=pg_attribute.attrelid
WHERE relkind IN ( 'm','v') AND attnum>=1 AND 
nspname NOT IN (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL))
SELECT table_schema, table_name, table_type, column_name, viewdef
FROM columns
WHERE (lower(column_name) IN ('min','max','sum','avg', 'count', 'string_agg', 'array_agg', 'json_agg')
AND viewdef~*'(min|max|sum|avg|count|string_agg|array_agg|json_agg)[(]')
OR lower(column_name) IN ('?column?')
ORDER BY table_schema, table_name, column_name;

Collections where the query belongs to

Collection name	Collection description
Find problems automatically	Queries, 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 .

Collection name

Collection description

Find problems automatically

Queries, 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 name	Category description
Comfortability of data management	Queries of this category provide information about the means that have been used to make the use or management of database more comfortable and thus, more efficient.
Derived tables	Queries of this category provide information about the derived tables (views, materialized views), which are used to implement virtual data layer.
Naming	Queries of this category provide information about the style of naming.

Category name

Category description

Comfortability of data management

Queries of this category provide information about the means that have been used to make the use or management of database more comfortable and thus, more efficient.

Derived tables

Queries of this category provide information about the derived tables (views, materialized views), which are used to implement virtual data layer.

Naming

Queries of this category provide information about the style of naming.

Reference materials for further reading

Reference
https://www.sqlstyle.guide/

Reference

https://www.sqlstyle.guide/