使用 WHERE NOT EXISTS 的堆叠 WHERE 语句中的 SQL 错误

Question

我的 SQL 语句中重复出现错误，但我不知道如何修复它。

ERROR:  syntax error at or near "WHERE"

也不是很有帮助。

这是有问题的代码片段：

INSERT INTO example.table (first, second, third, fourth, fifth) 
(SELECT first,second,third,fourth,'constant' 
 FROM example.table 
 WHERE some_id=42)
 WHERE NOT EXISTS
 (SELECT 1 
  FROM example.table 
  WHERE (first,third,status)=(SELECT first,third,'request'     FROM example.table 
  WHERE some_id=42));

一切都按预期工作，直到“WHERE NOT EXISTS”，但是如果我仅用值替换第二行而不是从表中搜索它们，一切也会正常。 我该如何修复此代码？

非常感谢！

Answer 1

也许

INSERT INTO example.table (first, second, third, fourth, fifth) 
SELECT first,second,third,fourth,'constant' 
FROM example.table 
WHERE some_id=42
 and NOT EXISTS
   (SELECT 1 FROM example.table 
    WHERE (first,third,status)=
       (SELECT first,third,'request' FROM example.table WHERE some_id=42));