您需要通过运行以下查询来检索表名：

SELECT *
FROM information_schema.constraint_table_usage
WHERE table_name = 'your_table'

或者，您可以使用pg_constraint来检索此信息

select n.nspname as schema_name,
       t.relname as table_name,
       c.conname as constraint_name
from pg_constraint c
  join pg_class t on c.conrelid = t.oid
  join pg_namespace n on t.relnamespace = n.oid
where t.relname = 'your_table_name';

然后，您可以运行所需的ALTER TABLE语句：

ALTER TABLE your_table DROP CONSTRAINT constraint_name;

当然，您可以使查询返回完整的ALTER语句：

SELECT 'ALTER TABLE '||table_name||' DROP CONSTRAINT '||constraint_name||';'
FROM information_schema.constraint_table_usage
WHERE table_name in ('your_table', 'other_table')

如果有多个模式具有相同的表，不要忘记在WHERE子句(和ALTER语句)中包括TABLE_SCHEMA。

如果你用的是9.x版的PG，你可以使用DO语句来运行它。只需像使用no_name的马一样操作，但将其应用于do语句。

DO $$DECLARE r record;
    BEGIN
        FOR r IN SELECT table_name,constraint_name
                 FROM information_schema.constraint_table_usage
                 WHERE table_name IN ('your_table', 'other_table')
        LOOP
            EXECUTE 'ALTER TABLE ' || quote_ident(r.table_name)|| ' DROP CONSTRAINT '|| quote_ident(r.constraint_name) || ';';
        END LOOP;
    END$$;

删除右外键约束

ALTER TABLE affiliations
DROP CONSTRAINT affiliations_organization_id_fkey;

注：

affiliations -> Table Name

affiliations_organization_id_fkey ->Constraint name

列出限制条件：

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 = 'your_schema' AND
      rel.relname = 'your_table';

解除限制：

ALTER TABLE your_schema.your_table DROP CONSTRAINT the_constraint_name;