| 861 | Perhaps IS DISTINCT FROM should be used instead of <> in WHEN clauses | Use a right predicate in trigger condition in order to ensure that the trigger executes always when it has to but not more often. IS DISTINCT FROM treats NULL as if it was a known value, rather than unknown. It would be relevant if a column that is referenced in the action condition is optional, i.e., permits NULLs. | General | INFORMATION_SCHEMA only | 2020-12-24 14:30 | MIT License | |
| 862 | All covering indexes | Find all covering indexes, which include data from additional columns in leaf blocks. | General | INFORMATION_SCHEMA+system catalog base tables | 2020-12-23 11:54 | MIT License | |
| 863 | 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 | |
| 864 | Derived tables with sorting | Find derived tables where the rows are ordered, i.e., there is ORDER BY clause at the end of the view. Different users may want to see the rows in different order. Thus, the DBMS may have to do extra and unnecessary work by firstly sorting based on one set of rows and after that based on other set of rows. Use sorting if you know that all the users want the rows in the same order and cannot/will not change the order in the application. | General | INFORMATION_SCHEMA+system catalog base tables | 2020-12-22 21:34 | MIT License | |
| 865 | Different search paths of SECURITY DEFINER functions | Find the different search paths used in case of SECURITY DEFINER functions and the number of their occurrences. Make sure that these have been specified correctly and consistently and that they do not refer to any non-existent schemas. | General | INFORMATION_SCHEMA+system catalog base tables | 2020-12-16 10:59 | MIT License | |
| 866 | Set operations that do not remove duplicate rows in derived tables | Find derived tables (views and materialized views) that use a set theoretic operation (union, except or intersect) in a manner that does not remove duplicate rows and thus can produce a multiset not a set. Make sure that it is what is needed. | General | INFORMATION_SCHEMA+system catalog base tables | 2020-12-10 13:32 | MIT License | |
| 867 | Derived tables with multiple DISTINCT's | Find derived tables (views and materialized views) that contain more than one DISTINCT invocation. Make sure that the query is correctly written, including that it does not have unwanted formation of a Cartesian product. | General | INFORMATION_SCHEMA+system catalog base tables | 2020-12-10 13:25 | MIT License | |
| 868 | Mandatory non-primary key columns | Find mandatory non-primary key columns, i.e., the columns that have NOT NULL constraint. | General | INFORMATION_SCHEMA+system catalog base tables | 2020-12-05 19:35 | MIT License | |
| 869 | Constraints that are redefined in a subtable. | Find primary key, unique, foreign key, and exclude constraints that have been defined in a supertable (parent table) and have been redefined in its subtable. | General | system catalog base tables only | 2020-12-02 17:28 | MIT License | |
| 870 | Different data types that are used to define base table columns | Find the number of different data types that are used to define base table columns as well as list all the different types. Data type constrains values in a column. Thus, in case there is a small number of used types, it raises a question as to whether the types have been optimally selected. | Sofware measure | INFORMATION_SCHEMA only | 2020-11-27 10:40 | MIT License | |
| 871 | Optional base table columns | Find optional base table columns, i.e., columns that permit NULLs. Are you sure you want to allow NULLs in these columns? | General | INFORMATION_SCHEMA only | 2020-11-21 03:02 | MIT License | |
| 872 | Find all non-foreign key columns of base tables | Find all non-foreign key columns of base tables. Make sure that no foreign key constraint is missing. | General | INFORMATION_SCHEMA+system catalog base tables | 2020-11-21 02:59 | MIT License | |
| 873 | Columns with array or user-defined type | Find columns with an array or a user-defined type. Each columns should have the most appropriate data type. | General | INFORMATION_SCHEMA+system catalog base tables | 2020-11-19 17:04 | MIT License | |
| 874 | Columns with JSON, JSONB, or XML type | Find columns with JSON, JSONB, or XML type. Each columns should have the most appropriate data type. | General | INFORMATION_SCHEMA+system catalog base tables | 2020-11-19 17:01 | MIT License | |
| 875 | Columns with BYTEA or OID type | Find columns with BYTEA or OID type. These columns are potentially meant for storing large objects. Each columns should have the most appropriate data type. | General | INFORMATION_SCHEMA+system catalog base tables | 2020-11-19 17:00 | MIT License | |
| 876 | 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 | 2020-11-19 15:30 | MIT License | |
| 877 | Table constraints with the cardinality bigger than one | Find constraints that involve more than one columns. Check as to whether the names follow a common style or not. | General | system catalog base tables only | 2020-11-19 13:34 | MIT License | |
| 878 | 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 | 2020-11-19 13:29 | MIT License | |
| 879 | Find all publications | Find publications of tables that have been created in order to enable logical replication. | General | INFORMATION_SCHEMA+system catalog base tables | 2020-11-18 15:09 | MIT License | |
| 880 | Foreign keys with ON DELETE CASCADE | Find referential constraints (foreign key constraints) that employ ON DELETE CASCADE compensatory action. ON DELETE CASCADE should only be used if it has been created based on a generalization or a composition in the conceptual data model or if the foreign key connects a table that corresponds to the main entity type with a table that corresponds to a non-main entity type. | General | system catalog base tables only | 2020-11-16 10:15 | MIT License | |