Domain CHECK constraints with the same name

Query goal:

Find domain check constraint names that are used more than once (within the same schema or in different schemas). Different things should have different names. However, here different constraints have the same name. Also make sure that this is not a sign of duplication of domains.

Query type:

Problem detection (Each row in the result could represent a flaw in the design)

Query reliability:

High (Few or no false-positive results)

Query license:

MIT License

Fixing suggestion:

Give different constraints different names.

Data source:

INFORMATION_SCHEMA only

SQL query:

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SELECT constraint_name, count(*) AS number_of_occurrences, string_agg(domain_schema || '.' || domain_name, ';<br>' ORDER BY domain_schema, domain_name) AS domains
FROM INFORMATION_SCHEMA.domain_constraints
WHERE domain_schema NOT IN (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL)
GROUP BY constraint_name
HAVING Count(*)>1
ORDER BY Count(*) DESC, constraint_name;

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

SQL query	Description
WITH domain_constraints AS (SELECT constraint_name, domain_schema, domain_name FROM INFORMATION_SCHEMA.domain_constraints WHERE domain_schema NOT IN (SELECT schema_name FROM INFORMATION_SCHEMA.schemata WHERE schema_name<>'public' AND schema_owner='postgres' AND schema_name IS NOT NULL)), duplicate_names AS (SELECT constraint_name FROM domain_constraints GROUP BY constraint_name HAVING Count(*)>1) SELECT format('ALTER DOMAIN %1$I.%2$I RENAME CONSTRAINT %3$I TO %3$s%2$s;', domain_schema, domain_name, constraint_name) AS statements FROM domain_constraints WHERE constraint_name IN (SELECT constraint_name FROM duplicate_names) ORDER BY domain_schema, domain_name;	Rename the constraint by adding domain name to the end of the constraint name.

SQL query

Description

WITH domain_constraints AS (SELECT constraint_name, domain_schema, domain_name
FROM INFORMATION_SCHEMA.domain_constraints
WHERE domain_schema NOT IN (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL)),
duplicate_names AS (SELECT constraint_name
FROM domain_constraints
GROUP BY constraint_name
HAVING Count(*)>1)
SELECT format('ALTER DOMAIN %1$I.%2$I RENAME CONSTRAINT %3$I TO %3$s%2$s;', domain_schema, domain_name, constraint_name) AS statements
FROM domain_constraints
WHERE constraint_name IN (SELECT constraint_name
FROM duplicate_names)
ORDER BY domain_schema, domain_name;

Rename the constraint by adding domain name to the end of the constraint name.

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
CHECK constraints	Queries of this category provide information about CHECK constraints.
Domains	Queries of this category provide information about reusable specifications of column properties.
Duplication of implementation elements	Queries of this catergory provide information about the duplication of the database objects.
Naming	Queries of this category provide information about the style of naming.

Category name

Category description

CHECK constraints

Queries of this category provide information about CHECK constraints.

Domains

Queries of this category provide information about reusable specifications of column properties.

Duplication of implementation elements

Queries of this catergory provide information about the duplication of the database objects.

Naming

Queries of this category provide information about the style of naming.