| 281 | Perhaps an unsuitable use of CHAR(n) type in base tables | Find non-foreign key base table columns with the type CHAR(n) where n>1 that are not meant for storing codes or hash values. CHAR(n) is suitable for storing values that have a fixed length (for instance, country code according to the ISO standard). In case of variable length strings the end of the stored string is padded with spaces. Thus, for instance, do not use CHAR(n) in case of columns for storing names, comments, descriptions, e-mail addresses etc. Hash values have a fixed length that depends on the used hash function. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-11-12 10:46 | MIT License | |
| 282 | Column names that make joining more difficult (foreign key column name contains the table name) | Find foreign keys where the name of the foreign key column and the corresponding primary key/unique column is different but the difference comes from the fact that the foreign key column name starts or ends with the table name. Simplify writing queries that have to join data from multiple base tables. If the columns that participate in the join condition have the same name, then one can use the USING syntax. | Problem detection | system catalog base tables only | 2023-11-12 10:26 | MIT License | |
| 283 | Number of tables covered by derived tables | Find the number of base tables, the number of base tables that are referred from at least one derived table (view or materialized view), the number of base tables that are referred from at least one view, and the number of base tables that are referred from at least one materialized view. If the database is used through the public database interface (virtual data layer), then, ideally, each table is referred from the subquery of at least one derived table. | Sofware measure | INFORMATION_SCHEMA+system catalog base tables | 2023-11-11 09:33 | MIT License | |
| 284 | Coverage by derived tables | Find for each base table the list of derived tables (both views and materialized views) that refer to the base table. If the database is used through the public database interface (virtual data layer), then, ideally, each table is referred from the subquery of at least one derived table. | General | INFORMATION_SCHEMA+system catalog base tables | 2023-11-11 09:31 | MIT License | |
| 285 | Number of underlying tables of derived tables | Find for each view or materialized view the number of tables based on which the derived table has been directly defined. These tables could be base tables or derived tables. | Sofware measure | INFORMATION_SCHEMA+system catalog base tables | 2023-11-11 09:30 | MIT License | |
| 286 | Useless type indication (2) | Find columns and parameters where the type of the identifier is perhaps explicitly indicated in the name. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-11-10 14:55 | MIT License | |
| 287 | Useless type indication | Find columns and parameters where the type of the identifier is perhaps explicitly indicated in the name. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-11-10 14:47 | MIT License | |
| 288 | 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 | |
| 289 | Perhaps USING syntax could be used for joining in the subqueries of derived tables | Find derived tables that use newer join syntax where join conditions are written in the WHERE clause but do not use USING synatx. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-11-10 14:14 | MIT License | |
| 290 | Perhaps brackets are missing in a regular expression that uses OR logical operation | Find regular expressions where choice between alternatives has no brackets. Thus, instead of '(a|b|c)' there is 'a|b|c'. An example: '^a|b|c$' -permits in the string symbol "|" but '^(a|b|c)$' does not permit in the string symbol "|". | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-11-09 20:22 | MIT License | |
| 291 | Deterministic (immutable) functions that do not have input parameters | Find deterministic functions that do not have any input parameters. Make sure that it is correct because in general a deterministic function must calculate a value based on input. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-11-09 19:53 | MIT License | |
| 292 | Columns of base tables that hold truth values that do not have a default value although they could have it (non-Boolean columns) | Find columns of base tables that do not have type BOOLEAN but are used to record Boolean values. Based on column names these implement a state machine or record agreements. At the same time the columns do not have a default value. There are only two truth values - TRUE and FALSE - in case of two-valued logic. It should be possible to select one of these as the default value of the column. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-11-09 16:40 | MIT License | |
| 293 | Columns of base tables that hold truth values that do not have a default value although they could have it (Boolean columns) | Find columns of base tables that have type BOOLEAN. Based on column names these implement a state machine or record agreements. At the same time the columns do not have a default value. There are only two truth values - TRUE and FALSE - in case of two-valued logic. It should be possible to select one of these as the default value of the column. | Problem detection | INFORMATION_SCHEMA only | 2023-11-09 16:39 | MIT License | |
| 294 | Length and char_lenfgth functions are used within the same expression | Find expressions that refer to both length and char_length functions. Make sure that the expression is correct. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-11-09 13:44 | MIT License | |
| 295 | Perhaps a state machine is implemented with Boolean columns | Find implementations of state machines that uses a set of one or more Boolean columns. These columns could have the type Boolean or could probably (based on the column name and non-participation in a foreign key) contain values that represent truth values. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-11-09 13:22 | MIT License | |
| 296 | Columns of base tables that hold truth values but do not have a default value (Boolean columns) | Find columns of base tables that have type BOOLEAN but do not have a default value. There are only two truth values - TRUE and FALSE - in case of two-valued logic. Often it should be possible to select one of these as the default value of a column that has BOOLEAN type. | Problem detection | INFORMATION_SCHEMA only | 2023-11-09 13:14 | MIT License | |
| 297 | Address field size is incorrect (too short or too long) | Find base table columns that are meant for recording different types of addresses where the filed size does not take into account the possible maximum length. | Problem detection | INFORMATION_SCHEMA only | 2023-11-09 12:55 | MIT License | |
| 298 | Base table columns permitting telephone numbers without digits | Find non-foreign key base table columns that name refers to the possibility that these are used to register phone numbers. Find the columns that do not have any simple CHECK constraint that references to the character class of digits. A simple check constraint covers a single column. In this case registration of e-mail addresses without digits is most probably not prohibited. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-11-09 12:52 | MIT License | |
| 299 | Table functions with OFFSET | Find table functions that use OFFSET. OFFSET method is a common way for implementing pagination. | Problem detection | INFORMATION_SCHEMA+system catalog base tables | 2023-11-09 12:13 | MIT License | |
| 300 | 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 | |