小编Ton*_*ali的帖子

鉴于：

CREATE TABLE A (
PK_A INT8 NOT NULL,
A INT8,
PRIMARY KEY (PK_A)
);

CREATE TABLE B (
PK_B INT8 NOT NULL,
B INT8,
PRIMARY KEY (PK_B)
);

这个查询：

insert into table_b (pk_b, b) 
select pk_a,a from table_a 
on conflict (b) do update set b=a;

导致以下错误：

ERROR:  column "a" does not exist
LINE 1: ...elect pk_a,a from table_a on conflict (b) do update set b=a;
                                                                 ^
HINT:  There is a column named "a" in table "*SELECT*", but it cannot …

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