Goal Find PL/pgSQL routines and SQL routines that do not have SQL-standard body that use unstandardized LIMIT clause instead of standardized FETCH FIRST n ROWS clause. The query excludes routines that are a part of an extension.
Notes Refers to the column pg_proc.prokind and thus works starting from PostgreSQL 11. In the returned body of routine the query replaces each newline character with the line break (br) tag 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. The query excludes routines that are a part of an extension.
Type Problem detection (Each row in the result could represent a flaw in the design)
Reliability Medium (Medium number of false-positive results)
License MIT License
Fixing Suggestion Use FETCH FIRST n ROWS syntax instead of LIMIT.
Data Source INFORMATION_SCHEMA+system catalog
SQL Query
SELECT 
  n.nspname AS routine_schema, 
  pr.proname AS routine_name, 
   pg_get_function_identity_arguments(pr.oid) AS parameters,
  regexp_replace(pg_get_functiondef(pr.oid),'[\r\n]','
','g') AS routine_src, CASE WHEN pr.prokind='f' THEN 'FUNCTION' WHEN pr.prokind='p' THEN 'PROCEDURE' WHEN pr.prokind='w' THEN 'WINDOW FUNCTION' END AS routine_type, l.lanname AS routine_language FROM pg_catalog.pg_proc pr, pg_catalog.pg_namespace n, pg_catalog.pg_language l WHERE pr.pronamespace = n.oid AND pr.prolang=l.oid AND pr.prokind<>'a' AND pg_get_functiondef(pr.oid)~*'[[:space:]]limit[[:space:]]' AND pr.proname NOT IN ('f_assume_you_must_use_files', 'f_check_format_comma_separated_list', 'f_check_password', 'f_default_value_with_no_match') AND NOT EXISTS (SELECT 1 FROM pg_catalog.pg_depend d WHERE EXISTS (SELECT 1 FROM pg_catalog.pg_extension e WHERE d.refobjid=e.oid) AND d.objid=pr.oid) AND n.nspname NOT IN (SELECT schema_name FROM INFORMATION_SCHEMA.schemata WHERE schema_name<>'public' AND schema_owner='postgres' AND schema_name IS NOT NULL) ORDER BY routine_schema, routine_name, parameters;
Collections

This query belongs to the following collections:

NameDescription
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

This query is classified under the following categories:

NameDescription
SyntacticsQueries of this category provide information about syntactic mistakes.
User-defined routinesQueries of this category provide information about the user-defined routines

Further reading and related materials:

Reference
https://www.postgresqltutorial.com/postgresql-tutorial/postgresql-fetch/