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
301 Duplicate keys Find completely overlapping key (primary key and unique) constraints. This is a form of duplication. It leads to the creation of multiple indexes to the same set of columns. Problem detection system catalog base tables only 2021-10-16 10:27 MIT License View
302 Duplicate materialized views Find materialized views with exactly the same subquery. There should not be multiple materialized views with the same subquery. 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 system catalog base tables only 2021-02-25 17:30 MIT License View
303 Duplicate non-fuction based unique indexes Find pairs of non-function based unique indexes that cover the same set of columns. Include indexes that support a constraint (primary key, unique, exclude), i.e., these indexes have been automatically created due to the constraint declaration. For instance, it helps us to find unique indexes that have been defined to already unique columns. Problem detection system catalog base tables only 2022-10-21 10:17 MIT License View
304 Duplicate NOT NULL constraints Find columns that have NOT NULL constraint through a domain and also directly. Do not duplicate NOT NULL constraints in orde to avoid confusion and surprises. Problem detection INFORMATION_SCHEMA+system catalog base tables 2021-02-25 17:30 MIT License View
305 Duplicate removal of duplicates in derived tables Find derived tables (views and materialized views) that contain both DISTINCT and GROUP BY. Make sure that the means for removing duplicate rows from the query result are not duplicated. Problem detection INFORMATION_SCHEMA+system catalog base tables 2025-01-15 14:16 MIT License View
306 Duplicate rules Find multiple rules with the same definition (event, condition, action) on the same table. 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 system catalog base tables only 2021-02-25 17:30 MIT License View
307 Duplicate specification of character classes Find regular expressions where within the same specification of a character class the character class alnum as well as 0-9, \d, A-Z, or a-z has been defined. Problem detection INFORMATION_SCHEMA+system catalog base tables 2023-12-24 10:43 MIT License View
308 Duplicate stored generated base table columns Find base tables that have more than one stored generated column with the same expression. The support of generated columns was added to PostgreSQL 12. 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
309 Duplicate triggers Find cases where the same table has multiple triggers with the same type (row-level, statement-level) that react to the same event with the same WHEN condition and with the same way (by invoking the same function). Problem detection INFORMATION_SCHEMA+system catalog base tables 2021-02-25 17:30 MIT License View
310 Duplicate user-defined routines Find user-defined routines with the exact duplicate body and parameters. There should not be multiple routines with exactly the same body and parameters (name, type). Having such duplicates is redundancy. Do remember that the same task can usually be solved in multiple different ways. Thus, the exact copies of routine bodies are not the only possible duplication. Moreover, it could be that different routines that solve the same task have different parameter names (but the parameters have the same types, ordinal positions, default values or the routines have different order of parameters). Thus, the query does not find all the duplications. Problem detection INFORMATION_SCHEMA+system catalog base tables 2021-11-05 11:59 MIT License View
311 Duplicate views Find views with exactly the same subquery. There should not be multiple views with exactly the same subquery. 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
312 Duplication of case insensitivity specification in a regular expression Find regular expressions that use both case insensitive search operator ~* and case insensitivity modifier (?i). Problem detection INFORMATION_SCHEMA+system catalog base tables 2021-11-04 12:49 MIT License View
313 Duplication of parent table CHECK constraints on the foreign key columns Find duplicate constraints, which make it more difficult to maintain the constraints. 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+system catalog base tables 2021-02-25 17:29 MIT License View
314 Duplication of simple CHECK constraints on the same column Find duplication of simple CHECK constraints on the same base table or foreign table column. Duplication of the same constraint means that if one starts to manage the code, then changes have to be made in multiple places. The problem is essentially similar with the data redundancy problem that database normalization tries to reduce. 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+system catalog base tables 2021-02-25 17:30 MIT License View
315 Each table is both referencing and referenced table (perhaps there is a cycle in relationships) Find as to whether the relationships between tables form a complete bidirected graph. Tables are vertices in the graph. There is a directed edge between two vertices if one of the tables refers to another through foreign key relationship on mandatory columns. Problem detection INFORMATION_SCHEMA+system catalog base tables 2024-07-01 14:23 MIT License View
316 Empty columns Find columns in non-empty tables that do not contain any values. If there are no values in a columns, then it may mean that one hasn't tested constraints that have been declared to the column or implemented by using triggers. It could also mean that such columns are not needed at all. Problem detection INFORMATION_SCHEMA+system catalog base tables 2021-02-25 17:29 MIT License View
317 Empty schemas Find schemas without schema objects. Problem detection INFORMATION_SCHEMA+system catalog base tables 2022-11-04 15:30 MIT License View
318 Empty tables Find base tables where the number of rows is zero. If there are no rows in a table, then it may mean that one hasn't tested constraints that have been declared to the table or implemented by using triggers. It could also mean that the table is not needed because there is no data that should be registered in the table. Problem detection system catalog base tables only 2022-10-21 15:55 MIT License View
319 Enumerated or range types with the same name in different schemas Find cases where in different schemas there are enumerated or range types with the same name. Types are like words that can be used to construct generalized claims about the real world (table predicates). Better not to duplicate the words in the dictionary. Also make sure that this is not a duplication. Problem detection INFORMATION_SCHEMA+system catalog base tables 2021-02-25 17:30 MIT License View
320 Enumerated types with zero or one value Fidn enumerated types with zero or one value. Type is a named finite set of values. The empty set is a set. A set with one value is a set. Thus, types with zero or one value are legal. In practical terms each type, usually, should contain at least two values. Problem detection INFORMATION_SCHEMA+system catalog base tables 2021-02-25 17:30 MIT License View