sql - SQL DELETE WITH JOIN 不起作用

Question

我有这个查询，它返回没有引用的关键字的所有记录查询正在工作，但我想删除所有这些记录，问题是如果我把 DELETE 而不是 SELECT 我得到错误。

SELECT Keywords.[Id]
  ,[QuoteId]      
  FROM [QuotesTemple].[dbo].[Keywords]
 LEFT JOIN [QuotesTemple].[dbo].Quotes ON Keywords.QuoteId=Quotes.Id
  WHERE Quotes.Id IS NULL

这不起作用。

DELETE
  FROM [QuotesTemple].[dbo].[Keywords]
  LEFT JOIN [QuotesTemple].[dbo].Quotes ON Keywords.QuoteId=Quotes.Id
  WHERE Quotes.Id IS NULL

我收到此错误：

消息 156，级别 15，状态 1，第 4 行关键字“LEFT”附近的语法不正确。

Answer 1

像这样写：

DELETE [QuotesTemple].[dbo].[Keywords] FROM [QuotesTemple].[dbo].[Keywords]
  LEFT JOIN [QuotesTemple].[dbo].Quotes ON Keywords.QuoteId=Quotes.Id
  WHERE Quotes.Id IS NULL

Answer 2

有效的语法是：

DELETE [QuotesTemple].[dbo].[Keywords]
FROM [QuotesTemple].[dbo].[Keywords] AS k
LEFT JOIN [QuotesTemple].[dbo].[Quotes] AS q ON k.QuoteId = q.Id
WHERE q.Id IS NULL

Answer 3

you can also write as below

delete t1 FROM projects AS t1 LEFT OUTER JOIN [QuotesTemple].[dbo].Quotes AS t2 on t1.QuoteId= t2.QuoteId where t2.Id is Null