[MASSMAIL]What is referential_action?

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От Ron Johnson
Тема [MASSMAIL]What is referential_action?
Дата
Msg-id CANzqJaDTmLjhOoZQv8KSid1jBK6C_qS2gMeE6OoTTntQV9MWEw@mail.gmail.com
обсуждение исходный текст
Ответы Re: What is referential_action?  (Christophe Pettus <xof@thebuild.com>)
Re: What is referential_action?  ("David G. Johnston" <david.g.johnston@gmail.com>)
Список pgsql-general
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Four times, the word "referential_action" is used on this page, but it's never mentioned what the possible referential actions are.

Am I missing something?


[ CONSTRAINT constraint_name ]
[snip]
  PRIMARY KEY index_parameters |
  REFERENCES reftable [ ( refcolumn ) ] [ MATCH FULL | MATCH PARTIAL | MATCH SIMPLE ]
    [ ON DELETE referential_action ] [ ON UPDATE referential_action ] }

[ CONSTRAINT constraint_name ]
[snip]
  FOREIGN KEY ( column_name [, ... ] ) REFERENCES reftable [ ( refcolumn [, ... ] ) ]
    [ MATCH FULL | MATCH PARTIAL | MATCH SIMPLE ] [ ON DELETE referential_action ] [ ON UPDATE referential_action ] }

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