PostgreSQL Query Catalog

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Filter Queries

Found 1036 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 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
822 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
823 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
824 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
825 System-generated domain CHECK constraint names Find the names of domain CHECK constraints that have been system-generated. Names should follow the same style. If there is a mix of system-generated and user-defined names, then the style is most probably different. Problem detection INFORMATION_SCHEMA only 2025-11-07 10:11 MIT License View
826 System-generated table constraint names (constraints that involve one column) Find the names of database constraints that have been system-generated. Additional restrictions are that the constraints must involve only one column and are associated directly with a table (not through a domain). Names should follow the same style. If there is a mix of system-generated and user-defined names, then the style is most probably different. Problem detection system catalog base tables only 2025-11-07 10:11 MIT License View
827 Table columns with NOT VALID CHECK constraints Find CHECK constraints of base table and foreign table columns that are not valid. These constraints have been created so that the existing data has not been checked against the constraint. It could be deliberate in case of legacy systems that have data quality problems. However, ideally all the data in the table conforms to the constraint. Problem detection INFORMATION_SCHEMA only 2025-11-07 10:11 MIT License View
828 Table constraints with the same name (constraints connected directly with a base table or a foreign table) Find base table and foreign table constraint names that are used in a database more than once (possibly in different schemas or in case of different types of constraints). Different things should have different names. But here different constraints have the same name. Also make sure that this is not a sign of duplication. Problem detection system catalog base tables only 2025-11-07 10:11 MIT License View
829 Table functions with OFFSET Find table functions that use OFFSET. OFFSET method is a common way for implementing pagination. Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
830 Table privileges have been granted to PUBLIC You should follow the principle of least privilege and thus not have in your database tables that usage privileges are granted to the pseudo-role PUBLIC, i.e., to all the database users now and in the future. Problem detection INFORMATION_SCHEMA only 2025-11-07 10:11 MIT License View
831 Table, routine, and usage privileges that have been granted to a superuser Find table, routine, and usage privileges that have been granted to a superuser. Superuser can do anything in the database and thus does not need the privileges. The result is a sign that perhaps the executed GRANT statements were incorrect (wrong username) or the grantee later got superuser status (that it shouldn't have). Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
832 Tables without columns Do not have in a database elements that are not useful. PostgreSQL permits tables with no columns. Such tables can be used to implement Boolean variables (tables TABLE_DEE and TABLE_DUM). On the other hand, such tables might be a result of database evolution, where developers have not noticed that they have dropped all the columns of a table or have not noticed that they have created such a table in the first place. Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
833 Temporal function in a simple check constraint is inconsistent with the column type Find base table columns with a check constraint that refers to a temporal function (current_timestamp, localtimestamp, current_date, or now) that return type is inconsistent with the data type of the column. Problem detection system catalog base tables only 2025-11-07 10:11 MIT License View
834 Textual columns that have a secondary index but the operator class for the column does not support pattern matching Find indexed textual columns where the indexing does not consider the possibility of pattern-based search. Such columns do not have an index where the used operator class makes the index suitable for use by queries involving pattern matching expressions. Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
835 TG_ARGV is missing Write correct code. If you pass arguments to a trigger function, then the function should use the arguments. TG_ARGV[]: "Data type array of text; the arguments from the CREATE TRIGGER statement. The index counts from 0. Invalid indexes (less than 0 or greater than or equal to tg_nargs) result in a null value." (PostgreSQL documentation) Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
836 The expression of a check constraint that is associated with a domain needs type conversion Find check constraints of domains where the Boolean expression invokes an operation that does not match with the data type of the domain. Problem detection system catalog base tables only 2025-11-07 10:11 MIT License View
837 The generator of surrogate key values can output the same value more than once Find surrogate keys where the generator can output the same value more than once. Key values must be unique, i.e., at some point the generator will prevent adding new rows to the table. Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
838 The generic names (columns) (aggregate view) Find the too generic column names and the number of their occurrences. Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
839 The maximum number of characters may be missing Perhaps the character maximum length has been omitted accidentally, i.e., one wrote VARCHAR instead of VARCHAR(n) where n is the maximum permitted number of characters in the field value. VARCHAR and TEXT are synonyms. Problem detection INFORMATION_SCHEMA only 2025-11-07 10:11 MIT License View
840 The name of the routine does not match with the action of the routine Find user-defined non-trigger SQL and PL/pgSQL routines where the beginning of the name of the routine indicates a certain action inside the routine (INSERT, UPDATE, or DELETE) but there is no such statement in the routine body. Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View