Re: INSERT ... ON CONFLICT DO UPDATE with _any_ constraint - Mailing list pgsql-hackers

On 19 May 2015 at 21:57, Simon Riggs <simon@2ndquadrant.com> wrote:

It's not clear to me how a single INSERT could cause two or more UPDATEs. 

​

CREATE TABLE mytable (

  c1 int NOT NULL,

  c2 int NOT NULL,

  PRIMARY KEY (c1),

  UNIQUE (c2)​

 

​);

INSERT INTO mytable (c1, c2) (10, 20);​

INSERT INTO mytable (c1, c2) (11, 21);

​INSERT INTO mytable (c1, c2) (10, 21) ON CONFLICT DO UPDATE .....

​

Or did you mean from a coding point of view how it would be possible to implement?