Postgresql delete cascade

DELETE FROM T_Client WHERE CLI_ID = x Sie erhalten dann eine Verletzung des Fremdschlüssels, da Sie den Client nicht löschen können, wenn er noch über Räume verfügt. Jetzt haben Sie Code in Ihre Anwendung geschrieben, der die Räume des Kunden löscht, bevor der Client gelöscht wird. However, if you want to use selective delete with a where clause, TRUNCATE is not good enough. I have many different tables that use the clients.

When I delete a client, I want it to delete all records in those many different tables that reference this client.

Delete the orders as well. If someone removes an order, the order items are removed as well. Analogous to ON DELETE there is also ON UPDATE which is invoked when a referenced column is changed (updated). The possible actions are the same. Durch ON DELETE RESTRICT kann sie nicht gelöscht werden, solange ihr Mitarbeiter zugeordnet sind.

Postgres taking 3h to DELETE CASCADE. Ask Question Asked year, months ago.

Active year, months ago. I was reading the manuals on DELETE and I saw this: By default DELETE will delete tuples in the table specified and all its sub-tables. If you wish to only update the specific table mentione you should use the ONLY clause. This feature is not available right now.

Please try again later. The alter table command lets you do quite a bit. But when it comes to altering existing constraints, there is not much you can do.

If you want to add an on delete cascade to an existing foreign key constraint, you are going to need two statements. CASCADE を指定する必要があります （ CASCADE を指定すると、テーブルに依存するビューは. You can use WHERE clause with DELETE query to delete the selected rows.

Otherwise, all the records would be deleted. Diese Antwort setzt voraus, dass Sie beabsichtigen, alle Zeilen dieser Tabellen zu löschen, nicht nur eine Auswahl. Here is a quick demonstration.

Suppose you had two tables orders and order_items where the order_items table references the orders. У меня есть таблица транзакция и срез, как.

Python 3：Pool是否保持传递给map的原始数据顺序？ 下一篇: node. DeprecationWarning：不推荐使用collection. I wrote a (recursive) function to delete any row based on its primary key. I wrote this because I did not want to create my constraints as on delete cascade.

I wanted to be able to delete complex sets of data (as a DBA) but not allow my programmers to be able to cascade delete without thinking through all of the repercussions. Vor mehr als einer Woche habe ich alle Zeilen in einer postgresql -Tabelle gelöscht (nicht über truncate , sondern über delete from). Do you say you can call delete cascade TestTable.

Однако таблицы не настроены с правилом ON DELETE CASCADE.