| 421 | Inconsistent use of older and newer join syntax in the subqueries of derived tables | Find as to whether the subqueries of derived tables use both older join syntax (join condition in the where clause) and newer syntax (join condition in the from clause). | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2024-01-24 13:26 | MIT License | |
| 422 | Inconsistent use of plural and singular in column names in the context of a relationship (English version) | Find foreign key constraints that cover one column in case of which the name of refererenced/referencing column is in plural and the name of referencing/refererenced column is in singular. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-01-13 14:14 | MIT License | |
| 423 | Inconsistent use of plural and singular in table names in the context of a relationship (English version) | Find foreign key constraints in case of which the name of one of the tables is in plural and the name of another table is in singular. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-01-13 13:41 | MIT License | |
| 424 | Inconsistent use of plural and singular in table names in the context of a relationship (Estonian version) | Find foreign key constraints in case of which the name of one of the tables is in plural and the name of another table is in singular. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2025-01-15 14:18 | MIT License | |
| 425 | Inconsistent use of session_user and current_user functions | Find as to whether both functions session_user and current_user are used in the database. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-12-30 11:37 | MIT License | |
| 426 | Incorrect characterization of a user-defined routine as an "immutable" routine | Find immutable routines that contain SELECT statements from a database (including SELECT .. FOR UPDATE), INSERT, UPDATE, DELETE, or LOCK statement. The DBMS should get a correct background information about the behaviour of a routine. Immutable routines should not have side effects and should also not ask data from a database because it could change over time. Immutable routines cannot lock tables or its specific rows. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2021-11-05 14:08 | MIT License | |
| 427 | Incorrect characterization of a user-defined routine as a "stable" routine | Find stable routines that contain INSERT, UPDATE, DELETE, SELECT … FOR UPDATE, or LOCK statement. The DBMS should get a correct background information about the behaviour of a routine. Stable routines cannot modify data in a database, lock tables, or its specific rows. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2021-11-05 13:59 | MIT License | |
| 428 | Incorrect check of NULLs | Find the use of =NULL and <>NULL in case of table level check constraints, domain level check constraints, WHEN clauses of triggers, WHERE clauses of rules, subqueries of derived tables, and bodies of routines. Write correct code. In order to determine as to whether a value is missing or not one has to use the IS [NOT] NULL predicate. NULL is the marker in SQL that denotes a missing value. Although it is often called "NULL value", one cannot treat it as an ordinary value, i.e., use it in comparisons as a value. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-11-12 12:10 | MIT License | |
| 429 | Incorrect comparison operator | Find PL/pgSQL routines that use comparison operators =< or =>. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-12-11 14:50 | MIT License | |
| 430 | Incorrect password hash update | Find row level update triggers that incorrectly implement update of password hash. It should not be that the new password hash is calculated based on the existing hash. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2021-02-25 17:29 | MIT License | |
| 431 | Incorrect prefix of a constraint name or an index name | If the name of an object has the prefix that refers to the type of the object (for instance, primary key constraint or foreign key constraint), then you should use references to the correct object type. Find prefixes of constraint names and index names that incorrectly refer to the type of the object. For instance, incorrect would be to use chk_ as the prefix of an index name or pk_ as the prefix of a check constraint name. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2024-12-28 10:48 | MIT License | |
| 432 | Incorrect reference to a system-defined function in the routine body | Find user-defined routines that possibly use incorrect name of a system-defined function (currenttimestamp (correct is current_timestamp), currentdate (correct is current_date), currenttime (correct is current_time), local_time (correct is localtime), local_timestamp (correct is localtimestamp),localdate (there is no such function),local_date (there is no such function), sessionuser (correct is session_user), ucase (correct is upper), lcase (correct is lower)). The problem can arise only if the routine uses dynamic SQL. In case of static SQL the DBMS checks the SQL statemen at the creation time and finds out that for instance, SELECT Count(*) AS cnt FROM Emp WHERE hiredate<=currentdate; is incorrect statement because currentdate is not a function name and there is no column currentdate in the table Emp. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2021-10-25 16:48 | MIT License | |
| 433 | Incorrect specification of logical or in regular expressions | Find the use of regular expressions where logical or is incorrectly specified, i.e., (| or |). | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-11-24 12:07 | MIT License | |
| 434 | Incorrect suffix of a constraint name or an index name | If the name of an object has the suffix that refers to the type of the object (for instance, primary key constraint or foreign key constraint), then you should use references to the correct object type. Find suffixes of constraint names and index names that incorrectly refer to the type of the object. For instance, incorrect would be to use _chk as the suffix of an index name or _pk as the suffix of a check constraint name. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2024-12-28 10:44 | MIT License | |
| 435 | INFORMATION_SCHEMA is missing | Make sure that you do not drop INFORMATION_SCHEMA schema. In this case most of the design checking queries will not work. This schema automatically exists in all databases. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2022-12-07 19:07 | MIT License | |
| 436 | Initially deferred constraint triggers with unnecessary locking | Initially deferred constraint triggers do not need explicit statements for locking tables or rows. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2021-10-08 11:25 | MIT License | |
| 437 | Input parameters that names do not follow the convention to start with _ or p_ | For the sake of making code better understandable follow naming conventions. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2021-02-25 17:30 | MIT License | |
| 438 | Input parameters with the same name have different types | Find named input parameters of routines that have the same name but different type. It could be a mistake or deliberate due to overloading of routines. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2024-01-24 15:01 | MIT License | |
| 439 | Insufficient number of user-defined non-trigger routines | There must be at least n (four in this case) user-defined non-trigger routines in the database. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2021-02-25 17:30 | MIT License | |
| 440 | Insufficient number of user-defined triggers+rules | There must be user-defined triggers and/or rules for at least n (three in this case) tasks in the database. It also means that one should create at least three triggers and/or rules in the database. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2024-01-04 11:47 | MIT License | |