Jul 20, 2020 · To dynamically generate a PostgreSQL script that creates a table with all its constraints, you can query the PostgreSQL system catalog tables (pg_catalog) to extract information about columns, primary keys, foreign keys, and check constraints.

May 2, 2023 · In PostgreSQL, the “pg_catalog” schema can be used with the “pg_constraint” and “pg_class” views to get the list of table constraints. More specifically, join both views and utilize the “relname” column to specify the name of the selected table:

Apr 14, 2016 · SELECT UPPER(conname) AS restriccion, UPPER(relname) AS tabla, UPPER(pg_catalog.pg_attribute.attname) AS columna FROM pg_catalog.pg_constraint, pg_catalog.pg_class, pg_catalog.pg_attribute WHERE contype = 'u' AND conrelid = pg_catalog.pg_class.oid AND conrelid = pg_catalog.pg_attribute.attrelid AND pg_catalog.pg_attribute.attnum = pg_catalog.pg ...

Apr 17, 2023 · SELECT con.* FROM pg_catalog.pg_constraint con INNER JOIN pg_catalog.pg_class rel ON rel.oid = con.conrelid INNER JOIN pg_catalog.pg_namespace nsp ON nsp.oid = connamespace WHERE nsp.nspname = '<schema name>' AND rel.relname = …

Feb 7, 2017 · One can use the following query to list constraints and their details for a certain table. SELECT conname AS constraint_name, contype AS constraint_type, conkey AS constrained_columns, confkey AS referenced_columns, confrelid::regclass AS referenced_table, conrelid::regclass AS constrained_table, CASE WHEN contype = 'f' …

Dec 9, 2024 · PostgreSQL exposes the constraints as well as other schema details through information_schema, so to find all the constraints for the table, query table_constraints, for example: WHERE table_name='my_table' AND constraint_type='UNIQUE'; To find which columns are involved into the constraints, check constraint_column_usage.

Jun 3, 2019 · Query below lists check constraints defined in the database ordered by constraint name. Check this query to see them organized by table. ccu.table_schema as table_schema, ccu.table_name, ccu.column_name, pgc.consrc as definition. from pg_constraint pgc. join pg_namespace nsp on nsp.oid = pgc.connamespace.

Aug 6, 2019 · You can execute this query. select distinct 'Alter table '||c.conrelid::regclass||' Add CONSTRAINT '||c.conname||' '|| pg_get_constraintdef(c.oid)||';' FROM pg_constraint c INNER JOIN pg_namespace n ON n.oid = c.connamespace CROSS JOIN LATERAL unnest(c.conkey) ak(k) INNER JOIN pg_attribute a ON a.attrelid = c.conrelid AND a.attnum = ak.k WHERE ...

Sep 9, 2021 · In this article, we learned about the Postgres check constraint. I have explained how we can create CHECK constraints using CREATE TABLE statement. Also, we learned how we can add a check constraint to an existing table using ALTER TABLE statement.

Aug 14, 2018 · Constraints can be retrieved via pg_catalog.pg_constraint. SELECT con.* FROM pg_catalog.pg_constraint con INNER JOIN pg_catalog.pg_class rel ON rel.oid = con.conrelid INNER JOIN pg_catalog.pg_namespace nsp ON nsp.oid = connamespace WHERE nsp.nspname = '<schema name>' AND rel.relname = '<table name>';