postgresql 插入 key不同的資料

postgresql sql

ioveasdkre 2022-01-07 17:00:37 ‧ 1016 瀏覽

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想請問我有 a表 b表兩表的欄位相同，要如何比對兩表，將A表沒有的key資料，插入

程式碼如下：
INSERT INTO well_info
select w.key ,w.site_name
from well_test as w
where w.key <> well_info.key

出現錯誤告訴我說，沒有 well_info.key
ERROR: invalid reference to FROM-clause entry for table "well_info"
LINE 4: where w.site_no <> well_info.site_no
^
HINT: There is an entry for table "well_info", but it cannot be referenced from this part of the query.
SQL 状态: 42P01
字符: 199

我嘗試多種方法
INSERT INTO well_info
select w.key ,w.site_name
from well_test as w
where w.key <> (select key from well_info)

外合併查詢也試過都無法解決