Use consistenly CHAR(1) in case of all the columns.
Data Source
INFORMATION_SCHEMA only
SQL Query
WITH short_chars AS (SELECT table_schema, table_name, column_name, ordinal_position, data_type
FROM INFORMATION_SCHEMA.columns
WHERE (table_schema, table_name) IN (SELECT table_schema, table_name
FROM INFORMATION_SCHEMA.tables WHERE table_type='BASE TABLE') AND
table_schema NOT IN (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL) AND data_type = 'character' AND
character_maximum_length=1),
short_varchars AS (SELECT table_schema, table_name, column_name, ordinal_position, data_type
FROM INFORMATION_SCHEMA.columns
WHERE (table_schema, table_name) IN (SELECT table_schema, table_name
FROM INFORMATION_SCHEMA.tables WHERE table_type='BASE TABLE') AND
table_schema NOT IN (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL) AND data_type = 'character varying' AND
character_maximum_length=1),
all_cols AS (SELECT table_schema, table_name, column_name, ordinal_position, data_type
FROM short_chars
UNION SELECT table_schema, table_name, column_name, ordinal_position, data_type
FROM short_varchars)
SELECT table_schema, table_name, column_name, data_type
FROM all_cols
WHERE EXISTS (SELECT * FROM short_chars)
AND EXISTS (SELECT * FROM short_varchars)
ORDER BY data_type, table_schema, table_name, ordinal_position;
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.
Inconsistencies
Queries of this catergory provide information about inconsistencies of solving the same problem in different places.