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Deferrable foreign key constraint with a RESTRICT compensating action

Query goal: Find deferrable foreign key constraint with ON UPDATE RESTRICT or ON DELETE RESTRICT compensating action. Referential actions are carried out before, and are not part of, the checking of a referential constraint. Deferring a referential constraint defers the checking of the of the constraint (a ) but does not defer the referential actions of the referential constraint. In PostgreSQL the essential difference between NO ACTION and RESTRICT is that NO ACTION allows the check to be deferred until later in the transaction, whereas RESTRICT does not. Thus RESTRICT could result with the failure of data modification where in case of NO ACTION the modification would succeed.
Query type: Problem detection (Each row in the result could represent a flaw in the design)
Query reliability: Low (Many false-positive results)
Query license: MIT License
Data source: system catalog only
SQL query: Click on query to copy it

WITH fk as (select
o.conname,
(select nspname from pg_namespace where oid=f.relnamespace) as foreign_schema,
f.relname as foreign_table,
f.oid as foreign_table_oid,
o.confkey AS foreign_col,
(select nspname from pg_namespace where oid=c.relnamespace) as target_schema,
c.relname as target_table,
c.oid as target_table_oid,
o.conkey AS target_col,
CASE WHEN o.confupdtype='a' THEN 'NO ACTION'
WHEN o.confupdtype='r' THEN 'RESTRICT'
WHEN o.confupdtype='c' THEN 'CASCADE'
WHEN o.confupdtype='n' THEN 'SET NULL'
WHEN o.confupdtype='d' THEN 'SET DEFAULT' END AS on_update,
CASE WHEN o.confdeltype='a' THEN 'NO ACTION'
WHEN o.confdeltype='r' THEN 'RESTRICT'
WHEN o.confdeltype='c' THEN 'CASCADE'
WHEN o.confdeltype='n' THEN 'SET NULL'
WHEN o.confdeltype='d' THEN 'SET DEFAULT' END AS on_delete
from pg_constraint o inner join pg_class c on c.oid = o.conrelid
inner join pg_class f on f.oid = o.confrelid
where o.contype = 'f'
and condeferrable='t'
and (o.confdeltype='r'
or o.confupdtype='r')),
fk_unnest as (select conname, foreign_schema, foreign_table,  foreign_table_oid, foreign_col, foreign_col_num, target_schema, target_table, target_table_oid, target_col, target_col_num, ordin, on_update, on_delete
from fk, unnest(fk.foreign_col, fk. target_col) with ordinality as f(foreign_col_num, target_col_num, ordin)),
fk_with_names as (select conname, foreign_schema, foreign_table, array_agg(a_foreign.attname order by ordin) as foreign_col, target_schema, target_table, array_agg(a_target.attname order by ordin) as target_col, on_update, on_delete
from fk_unnest fk inner join pg_attribute a_foreign on fk.foreign_col_num = a_foreign.attnum and fk.foreign_table_oid = a_foreign.attrelid and a_foreign.attisdropped = false
inner join pg_attribute a_target on fk.target_col_num = a_target.attnum and fk.target_table_oid = a_target.attrelid and a_target.attisdropped = false
group by conname, foreign_schema, foreign_table, target_schema, target_table,on_update, on_delete)
select conname, foreign_schema, foreign_table, foreign_col, target_schema, target_table, target_col, on_update, on_delete
from fk_with_names
order by target_schema, target_table, conname;

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
Relationships between tablesQueries of this category provide information about how database tables are connected to each other and whether such connections have been explicitly defined and whether it has been done correctly.
TransactionsQueries of this catergory provide information about the use of transactions.

Reference materials for further reading

Reference
https://vertabelo.com/blog/on-delete-restrict-vs-on-delete-no-action/

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