[英]Conditional insert statement in postgresql
我正在嘗試運行條件插入語句,但遇到了問題。 這里的聲明:
insert into category_content (category_id, content_id, content_type_id, priority) (select 29, id, 1, 1 from article where blog_id = 80)
where not exists(
select * from category_content where category_id = 29 and firstname in (select id from article where blog_id = 80)
);
這是我得到的錯誤:
ERROR: syntax error at or near "where"
LINE 2: where not exists(
^
********** Error **********
ERROR: syntax error at or near "where"
SQL state: 42601
Character: 153
您不能有兩個where子句,只有一個:
insert into category_content (category_id, content_id, content_type_id, priority)
select 29, id, 1, 1
from article
where blog_id = 80
and not exists(select *
from category_content
where category_id = 29
and content_id in (select id
from article
where blog_id = 80));
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