PostgreSQL Query Catalog

Project on GitHub
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
901 The number and percentage of base tables without CHECK constraints Find the extent in which data integrity is checked at the database level. Find the number and percentage of base tables that do not have any associated CHECK constraints. Sofware measure INFORMATION_SCHEMA only 2025-11-07 10:11 MIT License View
902 The number and percentage of base tables without keys Find the extent in which repeating rows are permitted in the database. Find the number and percentage (from the total number of base tables) of base tables that do not have the PRIMARY KEY constraint and also do not have any UNIQUE constraints. Sofware measure INFORMATION_SCHEMA only 2025-11-07 10:11 MIT License View
903 The number and percentage of different names of database objects Names should be expressive. Find the number of different names used in a database as well as the number of named database objects, and the percentage of different names from all the names. Names should be expressive. Different objects should have different names. The smaller the percentage the less descriptive are the names in the database. Find the number of different names (identifiers) of user-defined database objects and compare it with the total number of database objects. The values could be used to compare different databases. Sofware measure INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
904 The number and percentage of different names of database objects by object type "Names in software are 90 percent of what make software readable. You need to take the time to choose them wisely and keep them relevant. Names are too important to treat carelessly. Names should not cause confusion." (Robert C. Martin, Clean Code) Names should be expressive. Different objects should have different names. The smaller the percentage the less descriptive are the names in the database. Find the number of different names (identifiers) of user-defined database objects by the object type and compare it with the total number of database objects with this type. The values could be used to compare different databases. Sofware measure INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
905 The number and percentage of optinal columns in base tables Find the number and percentage of optinal columns in base tables Sofware measure INFORMATION_SCHEMA only 2025-11-07 10:11 MIT License View
906 The number of base table columns based on data type Find the number of base table columns based on data type. Sofware measure INFORMATION_SCHEMA only 2025-11-07 10:11 MIT License View
907 The number of base table columns by type category Find the number of base table columns based on the category of data type that the columns have. Sofware measure INFORMATION_SCHEMA only 2025-11-07 10:11 MIT License View
908 The number of columns based on table type Find the total number of columns in the different types of tables as well as average number of columns in the tables as well as minimal and maximal number of columns. Sofware measure INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
909 The number of commented routines Find the number of commented routines based on the way how the comments have been added (as a COMMENT object or as a comment in the routine body). Sofware measure INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
910 The number of compensating actions of foreign key constraints Find the number of compensating actions that are specified in case of foreign key constraints. Sofware measure system catalog base tables only 2025-11-07 10:11 MIT License View
911 The number of constraints by schema, by type, and in total Find the number of constraints in different schemas. The number of constraints 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
912 The number of default values Find the total number of columns with a default value as well as the number of columns with different kinds of default values (the number of columns where the default is used to implement surrogate key, the number of columns where the default is not used to implement surrogate key, the number of columns with a static default value, the number of columns with a dynamic default value). Sofware measure INFORMATION_SCHEMA only 2025-11-07 10:11 MIT License View
913 The number of derived table columns with an array, a user-defined, XML, JSON, or JSONB type Find the number of derived table columns with json, xml, array, or user-defined types. Such columns may contain data that has been aggregated/composed based on values in base tables. Sofware measure INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
914 The number of direct and indirect child tables (foreign keys) Find the number of direct and all (direct+indirect) child tables of a base table based on the foreign keys. The result may help to classify the data. If the number of direct children is small but the number of all children is large, then the table probably contains classifiers. If both the number of direct and all children is large, then the table probably contains master data. If the number of all children is small, then the table probably contains transactional data, logs, or descriptive information of main entities. Sofware measure system catalog base tables only 2025-11-07 10:11 MIT License View
915 The number of direct and indirect child tables (table inheritance) Find the number of direct and all (direct+indirect) child tables of a base table based on the table inheritance. Sofware measure system catalog base tables only 2025-11-07 10:11 MIT License View
916 The number of domains by schema and in total Identify the number of domains in different schemas. Sofware measure INFORMATION_SCHEMA only 2025-11-07 10:11 MIT License View
917 The number of names of database objects by the number of subcomponents in the names "Names in software are 90 percent of what make software readable. You need to take the time to choose them wisely and keep them relevant. Names are too important to treat carelessly. Names should not cause confusion." (Robert C. Martin, Clean Code) Names should be expressive. Find the number of names (identifiers) of user-defined database objects by the number of subcomponents in the names. The values could be used to compare different databases. Sofware measure INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
918 The number of names that use different writing styles Find the number of names of user-defined database objects that use snake_case, ALL CAPS, Sentence case, camelCase or PascalCase style. Make sure that the naming style is consistent. Sofware measure INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View
919 The number of referencing base tables Find how many base tables reference to a base table by using foreign keys. The more references there are the more impact the change of the table could have to the overall system. Sofware measure system catalog base tables only 2025-11-07 10:11 MIT License View
920 The number of routines by the number of input parameters Find the number of user-defined non-trigger routines by the number of input parameters. Sofware measure INFORMATION_SCHEMA+system catalog base tables 2025-11-07 10:11 MIT License View