| Seq nr | Name▲ | Goal | Type | Data source | Last update | License | ... |
|---|---|---|---|---|---|---|---|
| 21 | All identifying relationships | Find all non-identifying relationships where the foreign key (a set of columns) is a subset of a uniqueness constraint (primary key, unique, or exclude constraint). | General | system catalog base tables only | 2023-11-01 11:32 | MIT License | |
| 22 | All key constraints | Find all the primary key and unique constraints of base tables. | General | system catalog base tables only | 2021-10-16 10:37 | MIT License | |
| 23 | All non-identifying relationships | Find all non-identifying relationships where the foreign key (a set of columns) is not a subset of any uniqueness constraint (primary key, unique, or exclude constraint). | General | system catalog base tables only | 2023-11-01 11:31 | MIT License | |
| 24 | All non-unique indexes | Find secondary indexes that have been created in the database. | General | INFORMATION_SCHEMA+system catalog base tables | 2020-12-23 11:50 | MIT License | |
| 25 | All parameters with DEFAULT values | Find parameters of user-defined routines that have a default value. | General | INFORMATION_SCHEMA+system catalog base tables | 2020-11-06 14:51 | MIT License | |
| 26 | All partial indexes | Find indexes to a subset of table rows. | General | INFORMATION_SCHEMA+system catalog base tables | 2020-11-06 14:51 | MIT License | |
| 27 | All rules | Find user-defined rules for rewriting data manipulation language statements. Rules should be used only for the tasks that cannot be achieved in a declarative manner, i.e., for example, by declaring a constraint. | General | system catalog base tables only | 2023-12-22 12:30 | MIT License | |
| 28 | All security policies | Find all security policies. | General | system catalog base tables only | 2023-11-17 18:41 | MIT License | |
| 29 | All sequence generators | Find all sequence generators. | General | INFORMATION_SCHEMA+system catalog base tables | 2020-11-06 14:51 | MIT License | |
| 30 | All short cycles (tables) | Find pairs of tables that have both a 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. | General | INFORMATION_SCHEMA+system catalog base tables | 2021-11-27 20:54 | MIT License | |
| 31 | All supertables | Find all the base tables that serve as supertables in the inheritance hierarchies | Sofware measure | system catalog base tables only | 2021-03-14 17:07 | MIT License | |
| 32 | All system-defined TOAST-able types | Find system-defined types in case of which the system can use the TOAST technique, i.e., save the value in a compressed form or store it in a automatically-created secondary table, which is hidden from the database user (TOAST table). | General | system catalog base tables only | 2020-11-06 14:51 | MIT License | |
| 33 | All table CHECK constraints that cover at leat one column | Find all CHECK constraints (except NOT NULL) that are associated with a base table or a foreign table column. It is useful to enforce as many constraints at database level as possible. In this way one improves data quality as well as gives extra information to the database users (including the DBMS engines, development environments, and applications). | General | INFORMATION_SCHEMA only | 2024-01-01 11:27 | MIT License | |
| 34 | All table functions | Find all functions that return a set of rows. | General | INFORMATION_SCHEMA+system catalog base tables | 2023-10-29 11:39 | MIT License | |
| 35 | All the non-primary key columns are optional | Find base tables where all he non-primary key columns are optional. Avoid too many optional columns. You have to be extra careful with NULLs in case of formulating search conditions of data manipulation statements. | Problem detection | INFORMATION_SCHEMA only | 2021-02-25 17:30 | MIT License | |
| 36 | All unique keys have at least one optional column | Find base tables where all unique keys (sets of columns covered by a unique constraint, or a unique index) have at least one optional column. In this case there can be rows in the table where the values that should identify the row are missing. Because NULL is not a value and is not duplicate of another NULL the, follwing is possible: CREATE TABLE Uniq(a INTEGER NOT NULL, b INTEGER, CONSTRAINT ak_uniq UNIQUE (a, b)); INSERT INTO Uniq(a, b) VALUES (1, NULL); INSERT INTO Uniq(a, b) VALUES (1, NULL); | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-10-21 11:54 | MIT License | |
| 37 | All updatable views | Find all views through which it is possible to modify data in base tables. Is_insertable_into and is_updatable show as to whether the view is naturally updatable in PostgreSQL or has associated rules that make sure that INSERT/UPDATE/DELETE operations against the view will not cause an error. Please note that the rule could be DO INSTEAD NOTHING rule, i.e., data modification through the view does not cause an error but the data is not actually modified. If the updatability is achieved due to rules, then is_updatable=YES if the view has both UPDATE and DELETE rule that make sure that UPDATE and DELETE operations do not cause an error. | General | INFORMATION_SCHEMA only | 2024-01-14 17:09 | MIT License | |
| 38 | All user-defined TOAST-able types | Find user-defined types in case of which the system can use the TOAST technique, i.e., save the value in a compressed form or store it in a automatically-created secondary table, which is hidden from the database user (TOAST table). | General | system catalog base tables only | 2020-11-06 14:51 | MIT License | |
| 39 | All user mappings | Find all user mappings for foreign servers and tables | General | system catalog base tables only | 2020-11-11 17:00 | MIT License | |
| 40 | All user schemas | Find all the schemas in the database that are not used for the system purposes. | General | INFORMATION_SCHEMA only | 2022-11-04 15:14 | MIT License |