Find base table columns that have CHAR type, where character maximum length is bigger than 1 and the name of the column does not refer to the possibility that the column holds some kind of codes or flags or hash values.
Notes
The query takes into account both column names in Estonian and English.
Type
Problem detection (Each row in the result could represent a flaw in the design)
SELECT table_schema, table_name, column_name, character_maximum_length
FROM INFORMATION_SCHEMA.columns
WHERE data_type='character'
AND character_maximum_length>1
AND column_name !~*'(kood|code|flag|key|type|tyyp|state|status|seisund|olek|curr|currency|country|lang|keel|riik|parool|passw|hash|(?'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL)
ORDER BY table_schema, table_name, ordinal_position;
SQL statements that help generate fixes for the identified problem.
SQL Query to Generate Fix
Description
SELECT format('ALTER TABLE %1$I.%2$I ALTER COLUMN %3$I SET DATA TYPE VARCHAR(%4$s);', table_schema, table_name, column_name, character_maximum_length) AS statements
FROM INFORMATION_SCHEMA.columns
WHERE data_type='character'
AND character_maximum_length>1
AND column_name !~*'(kood|code|flag|key|type|tyyp|state|status|seisund|olek|curr|currency|country|lang|keel|riik|parool|passw|hash|(?'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL)
ORDER BY table_schema, table_name, ordinal_position;
Change the column type in case the column has not been defined by using a domain.
Collections
This query belongs to the following collections:
Name
Description
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 .
Categories
This query is classified under the following categories:
Name
Description
Data types
Queries of this category provide information about the data types and their usage.
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.
Validity and completeness
Queries of this category provide information about whether database design represents the world (domain) correctly (validity) and whether database design captures all the information about the world (domain) that is correct and relevant (completeness).