PostgreSQL Query Catalog

Candidate key is a minimal superkey, meaning that it is not possible to remove columns from the candidate key without losing its uniqueness property. One should define primary key's and unique constraints based on candidate keys. Find primary keys and unique constraints where a proper subset of the key is a column with an associated sequence generator. Most certainly such subset contains unique values. Thus, this subset should be the key, not its superset.

Character classes are surrounded by two pairs of square brackets.

Check as to wheteher the names of routine parameters are in the plural or in the singular form. Make sure that you are consistent in naming.

Check as to wheteher the names of routine parameters are in the plural or in the singular form. Make sure that you are consistent in naming.

Check as to wheteher the names of table columns are in the plural or in the singular form. Make sure that you are consistent in naming.

Check as to wheteher the names of table columns are in the plural or in the singular form. Make sure that you are consistent in naming. Show the number of columns that name is in plural or in singular by table type.

Check as to wheteher the names of tables are in the plural or in the singular form. Make sure that you are consistent in naming.

Check as to wheteher the names of tables are in the plural or in the singular form. Make sure that you are consistent in naming.

Check as to wheteher the names of tables are in the plural or in the singular form. Make sure that you are consistent in naming.

Check as to wheteher the names of tables are in the plural or in the singular form. Make sure that you are consistent in naming. Show the number of tables that name is in plural or in singular by table type.

Check as to whether there are no unnecessary privileges.

CHECK constraints with the cardinality bigger than one that involve the same set of columns. Make sure that there is no duplication.

Choose a suitable data type, field size, and default value. If the default value is shorter from the character maximum length, then spaces will be added to the end of the registered value.

Code should be as compact as possible and system should make as little work as necessary in order to solve a task. Thus, instead of deleting different rows of the same table with different DELETE statements one should try to do it with one statement. The query excludes routines where IF statement is used.

Code should be as compact as possible and system should make as little work as necessary in order to solve a task. Thus, instead of selecting different fields of the same row with different SELECT INTO statements one should try to do it with one statement.

Code should be as compact as possible and system should make as little work as necessary in order to solve a task. Thus, instead of updating different fields of the same table with different UPDATE statements one should try to do it with one statement.

Database must be used by users who have minimal set of privileges for performing tasks. The query helps to find out as to whether some user/role other than PUBLIC and a superuser have rights to use tables and routines of the database.

Declaring a column to have the type TEXT or the type VARCHAR (without the maximum number of characters) has the same end result in terms of what data can be recorded in the column. Nevertheless, one should try to stick with using one of the type names in order to cause less confusion. "If you do something a certain way, do all similar things in the same way." (Robert C. Martin, Clean Code)

Delimited identifiers (quoted identifiers) are case sensitive. Identifiers of database objects should be case insensitive in order to simplify their management.

Depth of referential tree of a database schema is the longest referential path between the tables in this schema (Piattini et al., 2001). In other words, it is the biggest value among the DRT(T) values of all the tables of the schema.