[英]How to select rows that fail exclusion constraint
I have a table with rows in it (source) that I am trying to insert into another table (target). 我有一个包含行(源)的表,试图将其插入另一个表(目标)。 The target has an exclusion constraint in place.
目标具有适当的排除约束。 However, when I do this, some of the rows fail the exclusion constraint.
但是,当我这样做时,某些行无法通过排除约束。 I would like to be able to select these rows in the source, that fail the exclusion constraint.
我希望能够在源代码中选择这些排除排除约束的行。 Is this possible?
这可能吗?
create table target(
id bigint primary key
,external_data_source_id bigint not null
,external_id text not null
,external_id_domain_id bigint not null
,internal_id bigint not null
,valid_period tstzrange not null
,EXCLUDE USING gist (external_data_source_id with = , external_id_domain_id with =, internal_id with =, external_id with =, valid_period WITH &&)
);
create table source(
id bigint primary key
,external_data_source_id bigint not null
,external_id text not null
,external_id_domain_id bigint not null
,internal_id bigint not null
,valid_period tstzrange not null
);
insert into source
select 1,1,'text',1,1,tstzrange('2000-01-01','2001-01-01');
insert into source
select 2,1,'text',1,1,tstzrange('2000-01-01','2001-01-01');
insert into source
select 1,'text',1,1,tstzrange('2002-01-01','2004-01-01');
insert into target
select * from source;
gives 给
Error: ERROR: conflicting key value violates exclusion constraint "target_external_data_source_id_external_id_domain_id_inter_excl"
Detail: Key (external_data_source_id, external_id_domain_id, internal_id, external_id, valid_period)=(1, 1, 1, text, ["2000-01-01 00:00:00+01","2001-01-01 00:00:00+01")) conflicts with existing key (external_data_source_id, external_id_domain_id, internal_id, external_id, valid_period)=(1, 1, 1, text, ["2000-01-01 00:00:00+01","2001-01-01 00:00:00+01")).
SQLState: 23P01
ErrorCode: 0
I would like to select the rows in source that fail this exclusion constraint. 我想选择源中未能通过此排除约束的行。
You can use condition from the exclusion constraint in an exists query: 您可以在存在查询中使用排除约束中的条件:
select s1.*
from source s1
where exists (select *
from source s2
where (s2.external_data_source_id, s2.external_id_domain_id,
s2.internal_id, s2.external_id)
= (s1.external_data_source_id, s1.external_id_domain_id,
s1.internal_id, s1.external_id)
and s1.valid_period && s2.valid_period
and s1.id <> s2.id
);
Online example: https://rextester.com/PDOE78609 在线示例: https : //rextester.com/PDOE78609
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