| 401 | Inconsistent naming of comment columns | Find columns of tables that start with the word comment or komment but end differently (excluding numbers). Return result only if there is more than one naming variant of such columns in the database. For instance, a column has the name "comment" but another "comments". | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2022-11-15 14:09 | MIT License | |
| 402 | Inconsistent precision and scale usage in case of registering sums of money | Find as to whether different precisions/scales are used in case of registering data about sums of money in different columns. | Problem detection | INFORMATION_SCHEMA only | 2021-03-29 13:07 | MIT License | |
| 403 | Inconsistent referencing to character classes | Find as to whether regular expressions use inconsistently references to character classes: [^\s], [^\d], [^\w], [^[:space:]], [^[:digit:]], [^[:word:]] vs [^\S], [^\D], [^\W]. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-11-09 12:02 | MIT License | |
| 404 | Inconsistent referencing to character classes (digits) | Find as to whether different syntaxes (e.g., 0-9 vs [[:digit:]] or \d) are used to refer to the character class of digits within the same database. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-11-01 11:57 | MIT License | |
| 405 | Inconsistent referencing to character classes (shorthand vs long name) | Find as to whether different syntaxes (e.g., \s vs [[:space:]]) are used to refer to character classes within the same database. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2024-11-19 11:24 | MIT License | |
| 406 | Inconsistent referencing to character classes (shorthand vs long name) (2) | Find as to whether different syntaxes (e.g., \w vs [[:alnum:]]) are used to refer to alphanumeric characters within the database. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2024-11-19 11:32 | MIT License | |
| 407 | Inconsistent time zone and precision usage in case of registering times | Find as to whether different data types (with and without timezone) and precisions are used in case of registering times in different columns. | Problem detection | INFORMATION_SCHEMA only | 2023-11-04 12:30 | MIT License | |
| 408 | Inconsistent time zone and precision usage in case of registering timestamps | Find as to whether different data types (with and without timezone) and precisions are used in case of registering timestamps in different columns. | Problem detection | INFORMATION_SCHEMA only | 2023-11-04 12:28 | MIT License | |
| 409 | Inconsistent use of casting syntax in routines | Find as to whether PL/pgSQL routines and SQL routines that do not have SQL-standard body use different syntax for casting (cast function vs :: operator). | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-10-29 11:33 | MIT License | |
| 410 | Inconsistent use of functions and procedures | Find as to whether the database has both procedures as well as functions that do not return a value (i.e., return VOID). Such routines are generally used to modify data in the database. The support of procedures was added to PostgreSQL 11. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-10-26 15:05 | MIT License | |
| 411 | Inconsistent use of gratuitous context in the names of non-foreign key and non-candidate key columns | Find the number of names on base table columns that are not a part of a candidate key and a foreign key and that contain the name of the table. Find the number of names on base table columns that are not a part of a candidate key and a foreign key and that do not contain the name of the table. Make sure that table name is used consistently in the column names. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-10-26 20:25 | MIT License | |
| 412 | Inconsistent use of length and char_length functions | Find as to whether both functions length and char_length are used in the database. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-11-10 14:38 | MIT License | |
| 413 | 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 | |
| 414 | 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 | |
| 415 | 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 | |
| 416 | 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 | |
| 417 | 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 | |
| 418 | 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 | |
| 419 | 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 | |
| 420 | 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 | |