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'

Source: stackoverflow.com

Similar codes

0 vote324 views1 answer
Open postgresql.conf in centos
SQL
18 votes330 views3 answers
Mysql add column default value
SQL
2 votes312 views1 answer
Node and mysql like
SQL
0 vote325 views1 answer
Sql tablo sp
SQL
0 vote322 views2 answers
Postgres having
SQL
0 vote341 views1 answer
Least spark sql
SQL
8 votes331 views1 answer
Check mysql version phpmyadmin
SQL
0 vote313 views1 answer
Join in update query in mysql
SQL
1 vote319 views1 answer
Mysql illegal mix of collations for operation 'join'
SQL
1 vote311 views1 answer
Postgres select as csv
SQL