PostgreSQL Query Catalog

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Filter Queries

Found 1053 queries.

  • All the queries about database objects contain a subcondition to exclude from the result information about the system catalog.
  • Although the statements use SQL constructs (common table expressions; NOT in subqueries) that could cause performance problems in case of large datasets it shouldn't be a problem in case of relatively small amount of data, which is in the system catalog of a database.
  • Statistics about the catalog content and project home in GitHub that has additional information.

# Name Goal Type ▲ Data source Last update License
821 Sometimes current_timestamp, sometimes now() Find as to whether you sometimes use current_timestamp function and sometimes now() function. These implement the same functionality. Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
822 Sometimes extract, sometimes date_part Find as to whether you sometimes use date_part function and sometimes extract function. These implement the same functionality. Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
823 Sometimes regexp_like, sometimes ~ Find as to whether you sometimes use regexp_like function and sometimes ~ operator. These implement the same functionality. regexp_like function that was added to PostgreSQL 15 and provides the same functionality as ~ and ~* operators. Try to be consistent. Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
824 Sorting rows based on random values in derived tables Find derived tables (views and materialized views) that sort rows based on random values. This can be used to find a random subset of rows. It is a computationally expensive operation. Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
825 Sorting rows based on random values in derived tables without limiting rows Find derived tables (views and materialized views) that sort rows based on random values but do not limit the number of rows. This is unnecessary because without sorting the rows are returned in a unspecified order. Sorting based on random values is a computationally expensive operation. Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
826 Sorting rows based on random values in routines Find routines that contain a statement that sorts rows based on random values. This can be used to find a random subset of rows. It is a computationally expensive operation. Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
827 Sorting rows based on random values in routines without limiting rows Find routines that contain a statement that sorts rows based on random values but do not limit the number of rows. This is unnecessary because without sorting the rows are returned in a unspecified order. Sorting based on random values is a computationally expensive operation. Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
828 SQL function does not return a value Find SQL functions that do not return a value (return VOID) but the SQL statement in the function has RETURNING clause. Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
829 STATEMENT level triggers and ROW level AFTER triggers without RETURN NULL Write correct code "The return value of a row-level trigger fired AFTER or a statement-level trigger fired BEFORE or AFTER is always ignored; it might as well be null." (PostgreSQL documentation) Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
830 STATEMENT level triggers that refer to the values of row variables NEW or OLD Find STATEMENT level triggers that refer to the values of row variables NEW or OLD. NEW and OLD are special variables that can only be used in row-level trigger procedures. Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
831 Stating the obvious Find database objects that name contains words "data" or "info". These are noise words because databases are meant for storing and manipulating data/information. Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
832 Stating the obvious (2) Find the names of database objects where the name of the database object contains a part of the name of the object type. For instance, the query finds base tables, were the name contains fragments _base, base_, _table, or table_. Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
833 Stating the obvious (column names) Find the names of columns where the name of the column contains a part of the name of the data type of the column. For instance, the query finds columns, were the name contains fragments integer_ or _integer. Problem detection INFORMATION_SCHEMA only 2025-11-07 10:11 MIT License View
834 Storing a duration as time Find columns of base and foreign tables that based on the column names are used to register durations but the type of the column is time. "It is possible to use a TIME data type if the duration is less than 24 hours, but this is not what the type is intended for, and can be the cause of confusion for the next person who has to maintain your code." Problem detection INFORMATION_SCHEMA only 2025-11-07 10:11 MIT License View
835 Storing a duration rather than a point in time Find columns of base and foreign tables that based on the column names and types are used to register start time and duration rather than start time and end time. Problem detection INFORMATION_SCHEMA only 2025-11-07 10:11 MIT License View
836 Subqueries of derived tables with LIMIT/FETCH/DISTINCT ON without ORDER BY Find subqueries of derived tables (views, materialized views) with the LIMIT/FETCH clause or with DISTINCT ON construct but without the ORDER BY clause. These constructs require sorting to produce a meaningful result. Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
837 Superfluous IS NULL checks in constraints This query identifies CHECK constraints that contain redundant logic for handling NULLs, a pattern often arising from a misunderstanding of SQL's three-valued logic (TRUE, FALSE, UNKNOWN). A CHECK constraint's condition only fails on FALSE, implicitly permitting NULLs by evaluating comparisons to UNKNOWN. Consequently, an explicit OR column IS NULL clause is tautological and adds no functional value, as demonstrated by the equivalence of CHECK (price IS NULL OR price > 0) and CHECK (price > 0). Removing this superfluous logic improves constraint clarity and eliminates a marginal but unnecessary computational step. Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-15 10:19 MIT License View
838 Surrogate key columns that do not follow the naming style Find surrogate key columns that name does not end with "id_" or start with "id_". Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
839 Surrogate keys in classifier tables This query identifies potential classifier (or reference) tables that contain a column populated by a sequence generator. In good database design, tables storing standard reference data should typically use natural keys rather than auto-incrementing surrogate keys. Problem detection INFORMATION_SCHEMA+system catalog base tables 2026-05-29 15:49 MIT License View
840 Surrogate keys using non-standard SERIAL pseudo-type This query identifies surrogate key columns defined using the legacy, PostgreSQL-specific SERIAL (or BIGSERIAL) pseudo-type. While functional, this notation is not part of the ISO SQL standard. The recommended best practice in modern PostgreSQL versions is to utilize GENERATED AS IDENTITY columns. Identity columns are standard-compliant and offer superior management of underlying sequences and permissions compared to the older SERIAL implementation. Problem detection INFORMATION_SCHEMA+system catalog base tables 2026-01-24 20:43 MIT License View