Обсуждение: [GENERAL] INSERT and ON CONFLICT

   I'm filling a table with rows and have the first batch successfully
inserted. When I add more rows there may be some that already exist in the
table and I would prefer that they be ignored and the insert process
continue.

   The syntax page for INSERT suggests that ON CONFLICT DO NOTHING is exactly
what I want to include in the command. Have I correctly interpreted what the
DO NOTHING option does when a row to be inserted already is present in the
table?

Rich

I believe the following test should answer your question.

db=# create table test ( a integer not null unique );
CREATE TABLE

db=# insert into test values (1);
INSERT 0 1

db=# insert into test values (1);
ERROR:  duplicate key value violates unique constraint "test_a_key"
DETAIL:  Key (a)=(1) already exists.

db=# insert into test values (1) on conflict do nothing;
INSERT 0 0



On Fri, Mar 10, 2017 at 12:35 PM, Rich Shepard <rshepard@appl-ecosys.com> wrote:
>   I'm filling a table with rows and have the first batch successfully
> inserted. When I add more rows there may be some that already exist in the
> table and I would prefer that they be ignored and the insert process
> continue.
>
>   The syntax page for INSERT suggests that ON CONFLICT DO NOTHING is exactly
> what I want to include in the command. Have I correctly interpreted what the
> DO NOTHING option does when a row to be inserted already is present in the
> table?
>
> Rich
>
>
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On Fri, 10 Mar 2017, Brian Dunavant wrote:

> I believe the following test should answer your question.

   Thank you, Brian. It does answer my question.

Regards,

Rich