Find columns of tables that start with the word comment or komment but end differently (excluding numbers). Return result only if there is more than one naming variant of such columns in the database. For instance, a column has the name "comment" but another "comments".
Notes
The query considers names like comment1, comment2, comment3 as the same naming variant. The query considers only columns with a textual type. The query takes into account that some columns can be defined based on a domain.
Type
Problem detection (Each row in the result could represent a flaw in the design)
WITH comment_cols AS (SELECT nspname AS table_schema, relname AS table_name,
CASE WHEN relkind='r' THEN 'BASE TABLE'
WHEN relkind='v' THEN 'VIEW'
WHEN relkind='m' THEN 'MATERIALIZED VIEW'
WHEN relkind='f' THEN 'FOREIGN TABLE'
WHEN relkind='p' THEN 'PARTITIONED TABLE'
END AS table_type, translate(attname,'1234567890','') AS column_name
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
INNER JOIN pg_type ON pg_attribute.atttypid =pg_type.oid
WHERE attnum>=1
AND relkind IN ('r','v','m','f','p')
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)
AND attname~*'^(kommentaar|comment)'
AND CASE WHEN typbasetype=0 THEN pg_type.typname
ELSE (SELECT typname
FROM pg_type AS domain_type
WHERE domain_type.oid=pg_type.typbasetype) END~*'(text|char)')
SELECT column_name, Count(*) AS nr_of_columns, string_agg(DISTINCT table_schema || '.' || table_name || ' (' || table_type || ')', '; ' ORDER BY table_schema || '.' || table_name || ' (' || table_type || ')') AS columns
FROM comment_cols
WHERE (SELECT Count(DISTINCT column_name) AS dist_names
FROM comment_cols)>1
GROUP BY column_name;
Collections
This query belongs to the following collections:
Name
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
This query is classified under the following categories:
Name
Description
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.