Find for each base table the list of routines (functions and procedures) that refer to the base table. If the database is used through the public database interface (virtual data layer), then, ideally, each table is referred from at least one routine.
Notes
The query uses the information_schema view routine_column_usage that was added to PostgreSQL 14. The view contains only information about routines that are written in SQL language and have the SQL-standard body. In case of the string_agg function, the line break (br) tag is used as a part of the separator for the better readability in case the query result is displayed in a web browser. There could be multiple routines with the same name but with different parameters in the same schema (overloading). Thus, for the unique identification of the routine it is necessary to present also its parameters in addition to the schema name and routine name.
Type
General (Overview of some aspect of the database.)
WITH routine_table AS (SELECT DISTINCT t.table_schema, t.table_name, rtu.routine_schema, rtu.routine_name, pg_get_function_identity_arguments(translate(substring(rtu.specific_name,'_[0-9]+$'),'_','')::int::oid) AS parameters, r.routine_type
FROM information_schema.tables AS t LEFT JOIN information_schema.routine_column_usage AS rtu USING (table_schema, table_name)
LEFT JOIN information_schema.routines AS r USING (specific_schema, specific_name)
WHERE t.table_type = 'BASE TABLE' AND t.table_schema 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,
string_agg(routine_schema || '.' || routine_name || '(' || parameters || ') (' || routine_type || ')', '; ' ORDER BY routine_schema, routine_name, parameters) AS list_of_routines,
Count(routine_schema) AS number_of_routines
FROM routine_table
GROUP BY table_schema, table_name
ORDER BY Count(routine_schema) DESC, table_schema, table_name;
Collections
This query belongs to the following collections:
Name
Description
Find problems by overview
Queries 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:
Name
Description
Does not work in some earlier PostgreSQL version
Queries of this category provide information that was not available in some earlier PostgreSQL version
User-defined routines
Queries of this category provide information about the user-defined routines