PostgreSQL 删除check约束的实现_PostgreSQL_

 \d dm_alarms_fct_20170613 "dm_alarms_fct_20170613_dm_transct_date_key_check" 

 ALTER TABLE "dm_alarms_fct_20170613" Drop constraint "dm_alarms_fct_20170613_dm_transct_date_key_check";

 SELECT tc.constraint_name, tc.table_name, kcu.column_name, ccu.table_name AS foreign_table_name, ccu.column_name AS foreign_column_name, tc.is_deferrable,tc.initially_deferred FROM information_schema.table_constraints AS tc JOIN information_schema.key_column_usage AS kcu ON tc.constraint_name = kcu.constraint_name JOIN information_schema.constraint_column_usage AS ccu ON ccu.constraint_name = tc.constraint_name WHERE constraint_type = 'UNIQUE' AND tc.table_name = 'table_name'; 

 ALTER TABLE table_name ADD CONSTRAINT uk_users_name1 UNIQUE (NAME);

 alter table table_name drop constraint if EXISTS uk_users_name1;