PostgreSQL Query Catalog

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Filter Queries

Found 997 queries.

  • All the queries about database objects contain a subcondition to exclude from the result information about the system catalog.
  • Although the statements use SQL constructs (common table expressions; NOT in subqueries) that could cause performance problems in case of large datasets it shouldn't be a problem in case of relatively small amount of data, which is in the system catalog of a database.
  • Statistics about the catalog content and project home in GitHub that has additional information.

# Name ▲ Goal Type Data source Last update License
281 Do not specify a list of values in a table column definition Find cases where the list of valid data values in the column is specified in the column definition (in addition to specifying the type of the column) by using, for instance, check constraints or enumerated types. The check constraint is either associated directly with a table or is associated with a domain. Problem detection INFORMATION_SCHEMA+system catalog base tables 2022-06-09 14:30 MIT License View
282 Do not use a generic attribute table Find base tables that implement a highly generic database design (EAV design - Entiry-Attribute-Value design), according to which attribute values are recorded in a generic table that contains attribute-value pairs. Problem detection INFORMATION_SCHEMA only 2021-03-07 17:40 MIT License View
283 Do not use approach that one size fits all (primary key columns) Find base base tables have the simple primary key that contains the column with the (case insensitive) name id and an integer type. In addition, the primary key values are generated automatically by the system by using a sequence generator. Problem detection INFORMATION_SCHEMA+system catalog base tables 2023-03-18 20:58 MIT License View
284 Do not use approach that one size fits all (unique index columns) Find base base tables have a simple unique index (not associated with a constraint) that contains the column with the (case insensitive) name id and an integer type. In addition, the key values are generated automatically by the system by using a sequence generator. Problem detection INFORMATION_SCHEMA+system catalog base tables 2023-01-07 15:12 MIT License View
285 Do not use dual-purpose foreign keys Find cases where the same column of a base table T is used to record references to multiple base tables. In addition, one has to add additional column to T for holding metadata about the parent table, referenced by the current row. Problem detection INFORMATION_SCHEMA only 2021-03-07 10:56 MIT License View
286 Do not use FLOAT Data Type Find base table columns that have FLOAT, REAL, or DOUBLE PRECISION type. "The data types real and double precision are inexact, variable-precision numeric types. On all currently supported platforms, these types are implementations of IEEE Standard 754 for Binary Floating-Point Arithmetic (single and double precision, respectively), to the extent that the underlying processor, operating system, and compiler support it." (PostgreSQL documentation) Do not use the approximate numeric types FLOAT, REAL, and DOUBLE PRECISION in order to present fractional numeric data. Due to the use of the IEEE 754 standard the results of calculations with the values, which have one of these types, can be inexact because out of necessity some numbers must be rounded to a value, which is very close. "Comparing two floating-point values for equality might not always work as expected." (PostgreSQL documentation) Problem detection INFORMATION_SCHEMA only 2021-03-12 15:41 MIT License View
287 Do not use the money data type Find base table columns with the Money data type. Each value of the money type has associated currency sign that depends on server settings. It could be $. Moreover, using the values for arithmetic operations requires casts that makes the code more complicated. Problem detection INFORMATION_SCHEMA only 2021-02-25 17:29 MIT License View
288 Double checking of the maximum character length Do not duplicate code. In this case a CHECK constraint duplicates the restriction that is already enforced with the help of the declaration of the maximum field size (for instance, VARCHAR(100)). Problem detection INFORMATION_SCHEMA+system catalog base tables 2023-11-18 13:27 MIT License View
289 Double negatives in Boolean expressions Write code that is simple to understand and not confusing. A double negative is a grammatical construction occurring when two forms of negation are used in the same expression (https://en.wikipedia.org/wiki/Double_negative). Double negatives in Boolean expressions make it more difficult to understand and maintain the code. Problem detection INFORMATION_SCHEMA+system catalog base tables 2021-02-25 17:29 MIT License View
290 Double negatives in regular expressions Fing regular expression patterns that use [^\S] instead of \s or [^\D] instead of \d or [^\W] instead of \w. Problem detection INFORMATION_SCHEMA+system catalog base tables 2023-11-09 12:01 MIT License View
291 Do you really need fractional seconds? Find default values that return current timestamp with the maximum number of fractional seconds (6). Problem detection INFORMATION_SCHEMA only 2021-02-25 17:29 MIT License View
292 Duplicate CHECK constraints that are connected directly to a table The same table should not have multiple CHECK constraints with exactly the same Boolean expression. Do remember that the same task can be solved in SQL usually in multiple different ways. Thus, the exact copies are not the only possible duplication. Problem detection INFORMATION_SCHEMA only 2021-02-25 17:30 MIT License View
293 Duplicate CHECK constraints that are connected to a domain The same domain should not have multiple CHECK constraints with exactly the same Boolean expression. Do remember that the same task can be solved in SQL usually in multiple different ways. Thus, the exact copies are not the only possible duplication. Problem detection INFORMATION_SCHEMA only 2021-02-25 17:30 MIT License View
294 Duplicate check of empty strings Find columns that have a check that prevents the empty string in the column but there is already another check on the column that enforces the constraint. If there is a constraint description!~'^[[:space:]]*$', then it covers the constraint description!='' and the latter becomes redundant. Problem detection INFORMATION_SCHEMA+system catalog base tables 2024-12-23 14:28 MIT License View
295 Duplicate comments Find comments that have been registered with a COMMENT statement and that are associated with more than one object. It would probably mean that a comment is incorrect or missing. Problem detection INFORMATION_SCHEMA+system catalog base tables 2024-12-21 17:31 MIT License View
296 Duplicate DEFAULT values of base table columns Find base table columns that have both default value determined through a domain and default value that is directly attached to the column. Do not duplicate specifications of default values to avoid confusion and surprises. If column and domain both have a default value, then in case of inserting data the default value that is associated directly with the column is used. Problem detection INFORMATION_SCHEMA only 2021-02-25 17:30 MIT License View
297 Duplicate domains Find domains that have the same properties (base type, character length, not null + check constraints, default value, collation). There should not be multiple domains that have the same properties. Do remember that the same task can be solved in SQL usually in multiple different ways. Therefore, the domains may have syntactically different check constraints that solve the same task. Thus, the exact copies are not the only possible duplication. Problem detection INFORMATION_SCHEMA only 2024-11-21 15:14 MIT License View
298 Duplicate enumerated types Find enumerated types with exactly the same values. There should not be multiple types that have the same values. Problem detection INFORMATION_SCHEMA+system catalog base tables 2021-02-25 17:30 MIT License View
299 Duplicate foreign key constraints Find duplicate foreign key constraints, which involve the same columns and refer to the same set of columns. Problem detection system catalog base tables only 2021-02-25 17:30 MIT License View
300 Duplicate independent (i.e., not created based on a table) composite types Find composite types with the same attributes (regardless of the order of attributes). Make sure that there is no duplication. Problem detection system catalog base tables only 2021-02-25 17:29 MIT License View