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Answers for "view all foreign key constraints postgres"

TypeScript
1

postgres check for foreign key

SELECT
    r.table_name
FROM information_schema.constraint_column_usage       u
INNER JOIN information_schema.referential_constraints fk
           ON u.constraint_catalog = fk.unique_constraint_catalog
               AND u.constraint_schema = fk.unique_constraint_schema
               AND u.constraint_name = fk.unique_constraint_name
INNER JOIN information_schema.key_column_usage        r
           ON r.constraint_catalog = fk.constraint_catalog
               AND r.constraint_schema = fk.constraint_schema
               AND r.constraint_name = fk.constraint_name
WHERE
    u.column_name = 'id' AND
    u.table_catalog = 'db_name' AND
    u.table_schema = 'public' AND
    u.table_name = 'table_a'
Posted by: Guest on October-06-2021
0

list all foreign keys for a table postgres

select kcu.table_schema || '.' ||kcu.table_name as foreign_table,
       '>-' as rel,
       rel_tco.table_schema || '.' || rel_tco.table_name as primary_table,
       string_agg(kcu.column_name, ', ') as fk_columns,
       kcu.constraint_name
from information_schema.table_constraints tco
join information_schema.key_column_usage kcu
          on tco.constraint_schema = kcu.constraint_schema
          and tco.constraint_name = kcu.constraint_name
join information_schema.referential_constraints rco
          on tco.constraint_schema = rco.constraint_schema
          and tco.constraint_name = rco.constraint_name
join information_schema.table_constraints rel_tco
          on rco.unique_constraint_schema = rel_tco.constraint_schema
          and rco.unique_constraint_name = rel_tco.constraint_name
where tco.constraint_type = 'FOREIGN KEY'
group by kcu.table_schema,
         kcu.table_name,
         rel_tco.table_name,
         rel_tco.table_schema,
         kcu.constraint_name
order by kcu.table_schema,
         kcu.table_name;
Posted by: Guest on July-30-2020
0

view all foreign key constraints postgres

SELECT
    tc.table_schema, 
    tc.constraint_name, 
    tc.table_name, 
    kcu.column_name, 
    ccu.table_schema AS foreign_table_schema,
    ccu.table_name AS foreign_table_name,
    ccu.column_name AS foreign_column_name 
FROM 
    information_schema.table_constraints AS tc 
    JOIN information_schema.key_column_usage AS kcu
      ON tc.constraint_name = kcu.constraint_name
      AND tc.table_schema = kcu.table_schema
    JOIN information_schema.constraint_column_usage AS ccu
      ON ccu.constraint_name = tc.constraint_name
      AND ccu.table_schema = tc.table_schema
WHERE tc.constraint_type = 'FOREIGN KEY' AND tc.table_name='mytable';
Posted by: Guest on October-28-2021

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