PostgreSQL Query Catalog

Project on GitHub
Filter Queries

Found 1050 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
921 The number of table constraints with the cardinality bigger than one Find the number of table constraints with the cardinality bigger than one. Find the number, based on the cardinality, constraint type, and cardinality+constraint type. Sofware measure system catalog base tables only 2025-11-07 10:11 MIT License View
922 The number of tables based on the number of columns Find how many tables with a certain range of the number of columns there are in the database. Sofware measure INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
923 The number of tables by schema, by type, and in total Find the number of tables (base, foreign, and derived) in different schemas. Sofware measure INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
924 The number of user-defined non-trigger routines by schema, by language, and by routine type Find the number of user-defined non-trigger routines based on their schema, language, and routine type. The routines can be used to implement virtual data layer. Thus the queriy gives some indications about the possible extent of the layer. Sofware measure INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
925 The number of user-defined non-trigger routines by schema, by security type, and by being deterministic Find the number of user-defined non-trigger routines based on their schema, security type, and being deterministic. The routines can be used to implement virtual data layer. Thus the queriy gives some indications about the possible extent of the layer. Sofware measure INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
926 The number of user-defined routines based on their database usage Find the number of non-extension routines in a database that modify data. The routines can be used to implement virtual data layer. Thus the queriy gives some indications about the possible extent of the layer. The query distinguishes trigger and non-trigger routines, thus it also gives information about triggers that modify data. Sofware measure INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
927 The number of user-defined rules Find the number of rules in a database, excluding the rules that are associated with system catalog tables and rules that are created to support views. Rules can be used to maintain data integrity in a database by causing rejection of incorrect insertions and updates. Therefore, the number of rules in a database gives some indications about the state of enforcing constraints at the database level. Sofware measure system catalog base tables only 2025-11-07 10:11 MIT License View
928 The number of user-defined rules by schema and in total Find the number of rules in a database in different schemas, excluding the rules that are created to support views. Rules can be used to maintain data integrity in a database by causing rejection of incorrect insertions and updates. Therefore, the number of rules in a database gives an indication about the state of enforcing constraints at the database level. Sofware measure system catalog base tables only 2025-11-07 10:11 MIT License View
929 The number of user-defined triggers Triggers can be used to maintain data integrity in a database by causing rejection of data that does not conform to certain rules. Therefore, the number of triggers in a database gives some indications about the state of enforcing constraints at the database level. The query does not count internal triggers. Sofware measure INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
930 The number of user defined triggers by different characteristics Find the number of user defined triggers by action orientation (ROW, STATEMENT), action timing (BEFORE, AFTER, INSTEAD OF), and event type (INSERT, UPDATE, DELETE) and their combinations. Sofware measure INFORMATION_SCHEMA only 2025-11-07 10:11 MIT License View
931 The number of user-defined triggers by schema, by type, and in total Triggers can be used to maintain data integrity in a database by causing rejection of data that does not conform to certain rules. Therefore, the number of triggers in a database gives an indication about the state of enforcing constraints at the database level. Sofware measure INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
932 The proportion of mandatory and optional textual base table columns Find the number of textual base table columns, the number of optional textual base table columns (permit NULLs), and the number of mandatory textual base table columns (do not permit NULLs). Sofware measure INFORMATION_SCHEMA only 2025-11-07 10:11 MIT License View
933 The proportion of using different integer types as types of base table columns Find the number of base table columns that use different integer types (SMALLINT, INTEGER, BIGINT) and their proportion from the overall set of columns that use an integer type. Sofware measure INFORMATION_SCHEMA only 2025-11-07 10:11 MIT License View
934 There is no reason to use PL/pgSQL if you do not use one or more features of a procedural language Using PL/pgSQL may cause context switching between declarative SQL and procedural PL/pgSQL. Thus use PL/pgSQL only if you truly need some of its constructs (variables, conditional statements, cycles, cursors, exception handling). Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
935 There is no reason to use PL/pgSQL to write table functions Using PL/pgSQL may cause context switching between declarative SQL and procedural PL/pgSQL. Thus use PL/pgSQL only if you truly need some of its constructs. You can create table functions by using SQL. Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
936 The same CHECK has a different name in different places Find the names of table CHECK constraints that have the same Boolean expression but a different naming style in different places (tables). The naming of constraints should be consistent. "If you do something a certain way, do all similar things in the same way." (Robert C. Martin, Clean Code)x Problem detection system catalog base tables only 2025-11-07 10:11 MIT License View
937 The same database object name is used repeatedly in case the same database object type Find what database object names are used more than once in case the objects of the same type. If the names differ from each other only by digits or underscores, then consider these the same name. For instance, if there are base tables Person and Person2 (in the same schema or different schemas), then the query returns the name Person. Make sure that there is no duplication of implementation elements in the database. General INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
938 The same name is used in different contexsts Find the names that are used in case of different types of elements Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
939 The same sequence generator is used in case of multiple columns Do not cause a potential performance bottleneck by having a shared resource. By having a shared sequence it is not possible to change properties of sequences of different tables independently (for instance the owner column or step), i.e., it increases coupling between tables. By having a shared sequence it is impossible to specify the owner (table column) to the sequence generator. Problem detection INFORMATION_SCHEMA only 2025-11-07 10:11 MIT License View
940 The same trigger function is used in case of multiple tables Find trigger functions that are used in case of more than one table. Although it is legal, one must be careful when changing the functions in order to avoid unwanted consequences. General INFORMATION_SCHEMA only 2025-11-07 10:11 MIT License View