PostgreSQL Query Catalog

Project on GitHub
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
181 The number and percentage of base tables where all the non-primary key columns are optional Find the number and percentage of base tables where all the non-primary key columns are optional Sofware measure INFORMATION_SCHEMA only 2020-11-08 19:57 MIT License View
182 The number and percentage of base tables without CHECK constraints Find the extent in which data integrity is checked at the database level. Find the number and percentage of base tables that do not have any associated CHECK constraints. Sofware measure INFORMATION_SCHEMA only 2020-11-08 19:15 MIT License View
183 The number and percentage of base tables without keys Find the extent in which repeating rows are permitted in the database. Find the number and percentage (from the total number of base tables) of base tables that do not have the PRIMARY KEY constraint and also do not have any UNIQUE constraints. Sofware measure INFORMATION_SCHEMA only 2020-11-08 19:16 MIT License View
184 The number and percentage of optinal columns in base tables Find the number and percentage of optinal columns in base tables Sofware measure INFORMATION_SCHEMA only 2020-11-08 21:17 MIT License View
185 The number of base table columns based on data type Find the number of base table columns based on data type. Sofware measure INFORMATION_SCHEMA only 2020-11-19 15:30 MIT License View
186 The number of base table columns by type category Find the number of base table columns based on the category of data type that the columns have. Sofware measure INFORMATION_SCHEMA only 2021-03-20 12:27 MIT License View
187 The number of default values Find the total number of columns with a default value as well as the number of columns with different kinds of default values (the number of columns where the default is used to implement surrogate key, the number of columns where the default is not used to implement surrogate key, the number of columns with a static default value, the number of columns with a dynamic default value). Sofware measure INFORMATION_SCHEMA only 2021-11-22 13:26 MIT License View
188 The number of domains by schema and in total Identify the number of domains in different schemas. Sofware measure INFORMATION_SCHEMA only 2020-11-06 14:51 MIT License View
189 The number of sequence generators in different schemas Identify the number of sequence generators in different schemas. Surrogate key values must be generated by using the system (the sequence generator mechanism in case of PostgreSQL). If there are no sequence generators, then there is a question as to whether there are no surrogate keys in the database at all (could be possible and OK) or (more probable) developers have forgotten to implement the generation of surrogate keys at the database level. An alternative is to implement generation of unique values at the application level or at the database level by using triggers. However, such implementation would most probably lead to the performance penalty because adding new rows to the table must be serialized, i.e., it can be done in one session at a time. Sofware measure INFORMATION_SCHEMA only 2021-03-07 20:55 MIT License View
190 The number of user defined triggers by different characteristics Find the number of user defined triggers by action orientation (ROW, STATEMENT), action timing (BEFORE, AFTER, INSTEAD OF), and event type (INSERT, UPDATE, DELETE) and their combinations. Sofware measure INFORMATION_SCHEMA only 2024-01-14 17:41 MIT License View
191 The proportion of mandatory and optional textual base table columns Find the number of textual base table columns, the number of optional textual base table columns (permit NULLs), and the number of mandatory textual base table columns (do not permit NULLs). Sofware measure INFORMATION_SCHEMA only 2021-01-15 17:39 MIT License View
192 The proportion of using different integer types as types of base table columns Find the number of base table columns that use different integer types (SMALLINT, INTEGER, BIGINT) and their proportion from the overall set of columns that use an integer type. Sofware measure INFORMATION_SCHEMA only 2021-03-03 12:41 MIT License View
193 The same sequence generator is used in case of multiple columns Do not cause a potential performance bottleneck by having a shared resource. By having a shared sequence it is not possible to change properties of sequences of different tables independently (for instance the owner column or step), i.e., it increases coupling between tables. By having a shared sequence it is impossible to specify the owner (table column) to the sequence generator. Problem detection INFORMATION_SCHEMA only 2021-03-07 21:07 MIT License View
194 The same trigger function is used in case of multiple tables Find trigger functions that are used in case of more than one table. Although it is legal, one must be careful when changing the functions in order to avoid unwanted consequences. General INFORMATION_SCHEMA only 2020-12-25 14:50 MIT License View
195 Three-valued logic (Boolean columns) Find base table columns that have Boolean type and do not have NOT NULL constraint. Use two-valued logic (TRUE, FALSE) instead of three-valued logic (TRUE, FALSE, UNKNOWN). Because NULL in a Boolean column means unknown make all the Boolean columns mandatory. Problem detection INFORMATION_SCHEMA only 2021-02-25 17:30 MIT License View
196 Too generic names (domain constraints) Find domain CHECK constraints that have a too generic name - for instance, the name contains word "data" ) or the name is an abbreviation of the constraint type name (for instance, "chk" or "chk1"). Problem detection INFORMATION_SCHEMA only 2021-10-31 17:39 MIT License View
197 Too short domain constraint names Find names of domain constraints that are shorter than the length of the name of the domain + two characters. Problem detection INFORMATION_SCHEMA only 2021-02-25 17:29 MIT License View
198 Too short view names Names should be expressive. Find views that name is shorter than the average length of the the names of its directly underlying tables (both base tables and derived tables). Problem detection INFORMATION_SCHEMA only 2021-02-25 17:29 MIT License View
199 Unnecessary usage of the numeric type in case of base table columns Find base table columns that have type NUMERIC and the scale is 0, i.e., one can record in the column only integer values. Arithmetic operations are slower in case of the numeric type compared to an integer type. Thus, in order to record integer values, one should use columns with the type SMALLINT, INTEGER, or BIGINT instead of NUMERIC(p,0). Problem detection INFORMATION_SCHEMA only 2021-02-25 17:30 MIT License View
200 Unused foreign data wrappers Find foreign data wrappers that do not have any associated foreign servers. Problem detection INFORMATION_SCHEMA only 2021-02-25 17:30 MIT License View