Question

我有两个表，产品（product_id）和性别（product_id，sex_id）。我试图从两个具有product_id的表中删除行，以便在sex_id和sex = 1的性别表中存在一行。到目前为止我已经

了

CREATE TEMPORARY TABLE tempTable
      SELECT p.product_id  
        FROM products AS p
  INNER JOIN sex AS s
          ON p.product_id = s.product_id 
       WHERE s.sex = 1;

 DELETE FROM products AS p
NATURAL JOIN tempTable AS t

DELETE查询抛出此错误：

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'NATURAL JOIN tempTable AS t' at line 2

此SELECT查询正常工作：

SELECT * FROM products
NATURAL JOIN tempTable

为什么SELECT查询有效，但DELETE查询不起作用？

Answer 1

因为DELETE有一个different syntax。您必须指定要从哪个表中删除。

所以做一个

DELETE p, t FROM products AS p NATURAL JOIN tempTable AS t;
DELETE p FROM products AS p NATURAL JOIN tempTable AS t;
DELETE t FROM products AS p NATURAL JOIN tempTable AS t;

当等效的SELECT工作时，为什么这个DELETE查询失败？

1 个答案: