Question

我的查询出现以下错误：

ERROR:  syntax error at or near "p"

这是我的疑问：

  DELETE p FROM property_import_image_results p
  LEFT JOIN LATERAL (SELECT q.created_at FROM property_import_image_results q
  WHERE q.external_url=p.external_url AND (q.listing_image_id = p.listing_image_id OR q.listing_image_id IS NULL)
  ORDER BY q.created_at DESC NULLS LAST LIMIT 1) as qf ON p.created_at = qf.created_at
  WHERE qf.created_at is NULL;

知道可能是什么问题吗？

Answer 1

您不能以这种方式表达您的查询。也许这就是你想要的：

DELETE FROM property_import_image_results p
    WHERE NOT EXISTS (SELECT 1
                      FROM property_import_image_results q
                      WHERE q.external_url = p.external_url AND
                            q.created_at > p.created_at AND 
                            (q.listing_image_id = p.listing_image_id OR  q.listing_image_id IS NULL)
                     ) ;

Answer 2

DELETE和FROM子句之间不需要p：http://www.w3schools.com/sql/sql_delete.asp。所以试着删除它。

Answer 3

虽然我不熟悉postgresql的具体内容，但您实际上并没有说过＆＃34;从mytable＆＃34;删除mytable。在删除语句的开头？不应该是＆＃34;从property_import_image_results p ...等删除。。等＆＃34;

DELETE FROM LEFT INNER JOIN的语法错误

3 个答案: