Goal This query identifies base table columns whose name and data type suggest they store row registration or last modification times, but which lack a default value. In good database design, such audit timestamp columns should typically have a default value (like CURRENT_TIMESTAMP or now()) to ensure the time is recorded automatically.
Notes The query considers both column names in English and Estonian.
Type Problem detection (Each row in the result could represent a flaw in the design)
Reliability Medium (Medium number of false-positive results)
License MIT (opens in new tab)
Fixing Suggestion Add a default value to the column that invokes a function that returns current timestamp.
Data Source INFORMATION_SCHEMA only
SQL Query 
SELECT A.table_schema, A.table_name , A.column_name, A.data_type, A.is_nullable
FROM information_schema.columns A
INNER JOIN information_schema.tables T USING (table_schema, table_name)
INNER JOIN information_schema.schemata S ON A.table_schema=S.schema_name
LEFT JOIN information_schema.domains D USING (domain_schema, domain_name)
WHERE domain_default IS NULL AND column_default IS NULL
AND A.data_type~*'(date|timestamp)'
AND A.column_name~*'(registr|loomis|lisamis|muutmis|creat|insert|update|change|modify)'
AND A.column_name!~*'(jargmine|lopp|next|end)'
AND T.table_type='BASE TABLE'
AND (A.table_schema = 'public'
OR S.schema_owner<>'postgres')
ORDER BY table_schema, table_name, ordinal_position;

Collections

This query belongs to the following collections:

Find problems about base tables

A selection of queries that return information about the data types, field sizes, default values as well as general structure of base tables. Contains all the types of queries - problem detection, software measure, and general overview

Find problems automatically

Queries, that results point to problems in the database. Each query in the collection produces an initial assessment. However, a human reviewer has the final say as to whether there is a problem or not .

NameDescription
Find problems about base tablesA selection of queries that return information about the data types, field sizes, default values as well as general structure of base tables. Contains all the types of queries - problem detection, software measure, and general overview
Find problems automaticallyQueries, that results point to problems in the database. Each query in the collection produces an initial assessment. However, a human reviewer has the final say as to whether there is a problem or not .

Categories

This query is classified under the following categories:

Default value

Queries of this catergory provide information about the use of default values.

Result quality depends on names

Queries of this category use names (for instance, column names) to try to guess the meaning of a database object. Thus, the goodness of names determines the number of false positive and false negative results.

Temporal data

Queries of this category provide information about temporal (time-related) data that is kept in the database.

NameDescription
Default valueQueries of this catergory provide information about the use of default values.
Result quality depends on namesQueries of this category use names (for instance, column names) to try to guess the meaning of a database object. Thus, the goodness of names determines the number of false positive and false negative results.
Temporal dataQueries of this category provide information about temporal (time-related) data that is kept in the database.