Non-updatable views with DO INSTEAD NOTHING rules

Query goal:

Find non-updatable views that have a DO INSTEAD NOTHING rule. The rule is used to prevent updates. However, the view is aniway non-updatable.

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

Fixing suggestion:

Drop the rules.

Data source:

INFORMATION_SCHEMA+system catalog

SQL query:

Click on query to copy it

WITH non_updatable_views AS (SELECT table_schema AS schema, table_name AS view
FROM Information_schema.views
WHERE (view_definition~'(JOIN|GROUP BY|HAVING|LIMIT|OFFSET|FETCH FIRST|DISTINCT|WITH|UNION|INTERSECT|EXCEPT)'
OR view_definition~*'(sum|count|avg|min|max|over)[[:space:]]{0,1}[(]')
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))
SELECT schemaname, tablename, rulename, definition   
FROM pg_rules
WHERE definition~'ON[[:space:]](INSERT|UPDATE|DELETE).*DO[[:space:]]INSTEAD[[:space:]]NOTHING'
AND (schemaname, tablename) IN (SELECT schema, view
FROM non_updatable_views)
ORDER BY schemaname, tablename, rulename;

SQL statements for generating SQL statements that help us to fix the problem

SQL query	Description
WITH non_updatable_views AS (SELECT table_schema AS schema, table_name AS view FROM Information_schema.views WHERE (view_definition~'(JOIN\|GROUP BY\|HAVING\|LIMIT\|OFFSET\|FETCH FIRST\|DISTINCT\|WITH\|UNION\|INTERSECT\|EXCEPT)' OR view_definition~'(sum\|count\|avg\|min\|max\|over)[[:space:]]{0,1}[(]') 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)) SELECT format('DROP RULE %1$I ON %2$I.%3$I;', rulename, schemaname, tablename) AS statements FROM pg_rules WHERE definition~'ON[[:space:]](INSERT\|UPDATE\|DELETE).DO[[:space:]]INSTEAD[[:space:]]NOTHING' AND (schemaname, tablename) IN (SELECT schema, view FROM non_updatable_views) ORDER BY schemaname, tablename, rulename;	Drop the rules.

SQL query

Description

WITH non_updatable_views AS (SELECT table_schema AS schema, table_name AS view
FROM Information_schema.views
WHERE (view_definition~'(JOIN|GROUP BY|HAVING|LIMIT|OFFSET|FETCH FIRST|DISTINCT|WITH|UNION|INTERSECT|EXCEPT)'
OR view_definition~*'(sum|count|avg|min|max|over)[[:space:]]{0,1}[(]')
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))
SELECT format('DROP RULE %1$I ON %2$I.%3$I;', rulename, schemaname, tablename) AS statements
FROM pg_rules
WHERE definition~'ON[[:space:]](INSERT|UPDATE|DELETE).*DO[[:space:]]INSTEAD[[:space:]]NOTHING'
AND (schemaname, tablename) IN (SELECT schema, view
FROM non_updatable_views)
ORDER BY schemaname, tablename, rulename;

Drop the rules.

Collections where the query belongs to

Collection name	Collection description
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 .

Collection name

Collection description

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 where the query belongs to

Category name	Category description
Derived tables	Queries of this category provide information about the derived tables (views, materialized views), which are used to implement virtual data layer.
Triggers and rules	Queries of this category provide information about triggers and rules in a database.

Category name

Category description

Derived tables

Queries of this category provide information about the derived tables (views, materialized views), which are used to implement virtual data layer.

Triggers and rules

Queries of this category provide information about triggers and rules in a database.