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Not inherited CHECK constraints that cover at least one column

Query goal: Find CHECK constraints that cover at least one column and that have been defined in a supertable (parent table) but not in its subtables. An entity that belongs to a subtype should also belong to its supertype. If a subtype entity satisfies some constraint, then logically it must also satisfy the constraints of the supertype as well. If CHECK constraints are not inherited, then this is not guaranteed. If you implement subtyping not merely reuse implementation in the subtables, then the subtables must have at least the same CHECK constraints as the supertable.
Query type: Problem detection (Each row in the result could represent a flaw in the design)
Query reliability: Medium (Medium number of false-positive results)
Query license: MIT License
Data source: system catalog only
SQL query: Click on query to copy it

with constr as (select
o.conname as constraint_name,
(select nspname from pg_namespace where oid=c.relnamespace) as supertable_schema,
c.relname as supertable,
c.oid as supertable_oid,
o.conkey AS constraint_col,
pg_get_constraintdef(o.oid) AS constraint_def
from pg_constraint o inner join pg_class c on c.oid = o.conrelid
where o.contype='c' 
and connoinherit='true'),

constr_unnest as (select constraint_name, supertable_schema, supertable, supertable_oid, constraint_col, constraint_col_num, ordin, constraint_def
from constr, unnest(constr.constraint_col) with ordinality as f(constraint_col_num, ordin)),
constr_with_names as (select constraint_name, supertable_schema, supertable, array_agg(a_target.attname order by ordin) as constraint_col, supertable_oid, constraint_def
from constr_unnest constr left join pg_attribute a_target on constr.constraint_col_num = a_target.attnum and constr.supertable_oid = a_target.attrelid and a_target.attisdropped = false
group by constraint_name, supertable_schema, supertable, supertable_oid, constraint_def)
select constraint_name, supertable_schema, supertable, constraint_def, 
(select string_agg(pc.nspname || '.' || c.relname,';<br>' ORDER BY pc.nspname, c.relname) AS cols
from pg_inherits pi
inner join pg_class c on pi.inhrelid=c.oid
inner join pg_namespace pc on c.relnamespace=pc.oid
where pi.inhparent=constr_with_names.supertable_oid) as tables_without_the_constraint
from constr_with_names 
order by supertable_schema, supertable, constraint_name;

Collections where the query belongs to

Collection nameCollection description
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 where the query belongs to

Category nameCategory description
CHECK constraintsQueries of this category provide information about CHECK constraints.
Table inheritanceQueries of this category provide information about the inheritance between base tables.

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