| 1 | All event triggers | Find event triggers, which are not associated to a specific schema object. | General | system catalog base tables only | 2020-12-24 14:54 | MIT License | |
| 2 | A routine is invoked only once | Find user-defined routines that are invoked by exactly one user-defined routine. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-12-10 17:11 | MIT License | |
| 3 | CHECKs are associated with a column instead of the domain of the column | Find simple check constraints (involve one column) that are associated with a base table column instead of the domain of the column. Common checks of data in columns that share the same domain should be described at the level of domain not at the level of columns. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2021-02-25 17:29 | MIT License | |
| 4 | Columns with exact/floating numeric types have textual default values | The default value of a column should belong to the type of the column. The system shouldn't conduct unnecessary type casts. | Problem detection | INFORMATION_SCHEMA only | 2021-02-25 17:29 | MIT License | |
| 5 | Columns with only one value | Find base table columns that contain only one value. Perhaps it is an unnecessary column. Having only one value is most likely inadequate for testing. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2021-02-25 17:29 | MIT License | |
| 6 | Comments of derived tables | Find comments of derived tables (views and materialized views) that are registered in the system catalog witht a COMMENT statement. Find also comments on their associated objects (columns, triggers, rules). Make sure that the comments give relevant, useful, and correct information. | General | system catalog base tables only | 2023-01-19 12:14 | MIT License | |
| 7 | Comments of non-derived tables | Find comments of non-derived tables (base tables, foreign tables, and partitioned tables) that are registered in the system catalog witht a COMMENT statement. Find also comments on their associated objects (columns, constraints, indexes, triggers, rules). Make sure that the comments give relevant, useful, and correct information. | General | system catalog base tables only | 2023-01-19 12:30 | MIT License | |
| 8 | Comments of routines | Find comments of user-defined routines (functions or procedures) that are registered in the system catalog witht a COMMENT statement. Make sure that the comments give relevant, useful, and correct information. | General | INFORMATION_SCHEMA+system catalog base tables | 2020-11-06 14:51 | MIT License | |
| 9 | Comments of schemas, sequences, types, domains, domain constraints, and event triggers | Find all the comments that have been added with a COMMENT statement to schemas, sequences, types, domains, and event triggers. | General | system catalog base tables only | 2023-01-19 15:04 | MIT License | |
| 10 | Consistency of comments of routines | Find user-defined routines that have a comment registered by the COMMENT statement and a comment within the routine body. Make sure that there are no inconsistencies between the comments. | General | INFORMATION_SCHEMA+system catalog base tables | 2021-11-04 10:56 | MIT License | |
| 11 | Constraints with the same name within the same schema and constraint type | Find names of foreign key constraints that are used within the same schema more than once. Find names of check constraints that are used within the same schema more than once. Find names of constraint triggers that are used within the same schema more than once. 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 | 2022-11-15 16:43 | MIT License | |
| 12 | Default should be declared at the level of domain not at the level of base table columns | Find domains that have been used to define one or more base table non-foreign key columns and all the columns have the same default value that is associated directly with the column not with the domain. Write as little code as possible. If possible, move things "before the brackets" so to say. In this case it means declaring the default value at the level of the domain and not at the level of base table columns. An exception is when the domain is used to define foreign key columns. In this case, it would be appropriate to define the default value at the column level (because different foreign keys could have different default values). | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2021-02-25 17:30 | MIT License | |
| 13 | Delimited identifiers | Delimited identifiers (quoted identifiers) are case sensitive. Identifiers of database objects should be case insensitive in order to simplify their management. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-03-18 16:38 | MIT License | |
| 14 | Derived table on top of another derived table | Do not build multiple levels of derived tables (views and materialized views) because it will hamper evolvability and understandability of the tables. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2021-02-25 17:29 | MIT License | |
| 15 | Domain based on another domain | Find domains that have been defined based on another domain. Do not specify domains based on existing domains. This would unnecessarily increase dependencies and complexity. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2021-02-25 17:29 | MIT License | |
| 16 | Domain candidates | Find column descriptions that are candidates for describing a domain. | General | INFORMATION_SCHEMA+system catalog base tables | 2020-11-06 14:51 | MIT License | |
| 17 | Domain declares the same default value for multiple independent foreign keys | Find domains that declare a default value and that are used in case of multiple foreign key constraints that point to different tables. Domains should be used in a manner that does not cause unnecessary coupling of concerns. For instance, let us assume that columns client_state_type_code of table Client (that is used to implement the relationship with table Client_state_type) and worker_state_type_code of table Worker (that is used to implement the relationship with table Worker_state_type) have been defined based on the same domain. It the domain has a default value, then it determines the initial state of both clients and workers. However, it must be possible to determine the initial state independently in case of clients and workers. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2021-02-25 17:29 | MIT License | |
| 18 | Domains with the same name in different schemas | Domains are like words that can be used to construct generalized claims about the real world (table predicates). Better not to duplicate the words in the dictionary. | Problem detection | INFORMATION_SCHEMA only | 2021-02-25 17:30 | MIT License | |
| 19 | Domain usage in base tables | Find for each domain the number of usages in base tables. The less you have managed to reuse domains in case of different columns, the more you have wasted your time by creating the domains. | General | INFORMATION_SCHEMA only | 2020-11-06 14:51 | MIT License | |
| 20 | Do not create multiple columns for the same attribute | Find base tables that implement recording multivalued attribute values with the help of repeating group of columns. Find base tables that have more than one columns with the same type and field size and the difference between the columns are the numbers in the column names (column1, column2, etc.). | Problem detection | INFORMATION_SCHEMA only | 2021-03-18 15:57 | MIT License | |