Find not valid foreign key constraints. These constraints have been created so that the existing data has not been checked against the constraint. It could be deliberate in case of legacy systems that have data quality problems. However, ideally all the data in the table conforms to the constraint.
Type
Problem detection (Each row in the result could represent a flaw in the design)
Validate the constraint after fixing the data problems.
Data Source
system catalog only
SQL Query
SELECT (select nspname from pg_namespace where oid=c.relnamespace) AS table_schema,
c.relname AS table_name,
o.conname AS constraint_name
FROM pg_constraint o INNER JOIN pg_class c ON c.oid = o.conrelid
WHERE o.contype = 'f' AND o.convalidated=false
ORDER BY table_schema, c.relname, o.conname;
SQL statements that help generate fixes for the identified problem.
SQL Query to Generate Fix
Description
WITH fk AS (SELECT (select nspname from pg_namespace where oid=c.relnamespace) AS table_schema,
c.relname AS table_name,
o.conname AS constraint_name
FROM pg_constraint o INNER JOIN pg_class c ON c.oid = o.conrelid
WHERE o.contype = 'f' AND o.convalidated=false)
SELECT format('ALTER TABLE %1$I.%2$I VALIDATE CONSTRAINT %3$I;', table_schema, table_name, constraint_name) AS statements
FROM fk
ORDER BY table_schema, table_name, constraint_name;
Validate the constraint.
Collections
This query belongs to the following collections:
Name
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
This query is classified under the following categories:
Name
Description
Relationships between tables
Queries 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.