PostgreSQL Query Catalog

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Filter Queries

Found 1040 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
681 SET NULL compensatory action is unsuitable Find foreign key constraints that use a SET NULL compensating action but a foreign key column is mandatory, i.e., does not permit NULLs. Compensatory actions cannot make changes that violate integrity constraints in a database. SET NULL cannot put NULL to a mandatory column (delete a foreign key value). Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
682 Set operations that do not remove duplicate rows in derived tables Find derived tables (views and materialized views) that use a set theoretic operation (union, except or intersect) in a manner that does not remove duplicate rows and thus can produce a multiset not a set. Make sure that it is what is needed. General INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
683 Short cycles (tables) Find pairs of tables that have both a mandatory (NOT NULL) and not defrerrable foreign key that references to the other table. Such cycles can involve more than two tables but the query detects only cycles with two tables. Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
684 Simplify regex by combining alpha and digit classes This query identifies regular expressions that can be simplified by consolidating separate character class references. It specifically targets patterns that explicitly match both alphabetic characters ([:alpha:]) and numeric digits ([:digit:], \d, or [0-9]) as separate components within a larger character set (e.g., [[:alpha:][:digit:]]). These distinct classes can be refactored into the single, more concise POSIX character class [:alnum:], which logically represents the union of both. Performing this simplification improves the readability and compactness of the regular expression without altering its behavior. Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-19 17:38 MIT License View
685 Single-column natural primary keys This query identifies primary keys that consist of a single column and are not system-generated (i.e., they are not associated with a sequence or defined as IDENTITY columns). This pattern is characteristic of a natural primary key, where the key's value is derived from a real-world, user-defined attribute rather than an arbitrary surrogate value. Identifying these keys is crucial for auditing a data model's key strategy and understanding its reliance on meaningful, potentially mutable, business data for entity identification. General INFORMATION_SCHEMA+system catalog base tables 2025-11-15 12:50 MIT License View
686 Small tables Find tables that have one column or zero columns. General INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
687 Snake_case violations detected by common suffixes This query identifies database identifiers (columns, parameters, etc.) that likely violate the snake_case naming convention based on suffix analysis. It flags names ending with common temporal or attributional terms (date, time, by) where the suffix is not immediately preceded by an underscore. This pattern is highly indicative of camelCase (e.g., createdDate, updatedBy) or PascalCase usage. Adhering to snake_case (e.g., created_date, updated_by) is the recommended standard for SQL database schemas to ensure consistency and readability. Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-27 11:13 MIT License View
688 Some candidate key values cannot be used as foreign key values Find foreign key constraints in case of which some candidate key values cannot be used as foreign key values. Primary key/unique columns and foreign key columns should have the same data type and field size. If, for instance, the primary key column has type INTEGER and foreign key column has type SMALLINT, then one cannot use all the primary key values as foreign key values. Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
689 Some CHECKS are associated with a domain and some with the base table columns that have the domain Find cases where some CHECKS are associated with a domain and some with the base table columns that have the domain. Avoid duplication of code. Write as little code as possible. If possible, move things "before the brackets" so to say. In this case it means declaring CHECKS at the level of the domain and not at the level of base table columns. Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
690 Some data modification functions return a value and some not Find as to whether there are data modification routines that return a value as well as data modification routines that do not return a value. Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
691 Something is still to do in routines Find routines where comments contain TODO phrase. Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
692 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
693 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
694 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
695 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
696 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
697 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
698 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
699 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
700 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