Question

我尝试在表lif_books中的表lif_bookhascategory和lb_sku中删除具有相同lbhc_lb_sku的连接表。我无法删除它。

这是我的SQL命令：

DeleteCommand="DELETE FROM lif_books FROM lif_books CROSS JOIN lif_bookshascategory WHERE (lif_books.lb_sku = @lb_sku) AND (lif_bookhascategory.lbhc_lb_sku = @lb_sku)">

返回：

Incorrect syntax near the keyword 'INNER'.

Answer 1

正式地说，SQL规范没有规定在动作查询中使用Join（插入，更新或删除）。在这种情况下，使用更通用的格式更简单：

Delete lif_books
Where lb_sku = @lb_sku
    And Exists  (
                Select 1
                From lif_bookhascategory
                Where lbhc_lb_sku = @lb_sku
                )

Answer 2

我刚刚在我自己的数据库上测试了它，它确实有效。

DELETE lif_bookshascategory, lif_books
FROM lif_bookshascategory
INNER JOIN lif_books
WHERE lbhc_lb_sku = lb_sku

Answer 3

这应该有效：

DELETE lif_bookshascategory, lif_books
FROM lif_bookshascategory
INNER JOIN lif_books 
  ON lif_bookshascategory.lbhc_lb_sku = lif_books.lb_sku

Here's the reference

SQL删除命令

3 个答案: