Question

请告诉我如何在LINQ To SQL中转换此SQL查询？提前谢谢。

SELECT [Movies].[Name]
FROM
(
    SELECT [Value]
    FROM [Index]
    WHERE ('WORD1' = [Word] and [MatchCount] = 1) 
    OR    ([Word] = 'WORD2' AND [MatchCount] = 1)
    GROUP BY [Value]
    HAVING COUNT([Value]) = 2
) AS [Guids]
LEFT OUTER JOIN [Movies] ON [Movies].[Guid] = [Guids].[Value]

Answer 1

在a previous question中，有人建议Linqer。

老实说，我自己从未使用过它，但我已广泛使用LinqPad。它做了相反的事情（以及将LINQ转换为lambda表达式），并且是我最喜欢的工具之一。

Answer 2

这样的东西？ （警告，以下代码未经测试！）

var q = from i in Index
  where i.MatchCount == 1 &&
  (i.Word == "WORD1" || i.Word == "WORD2")
  group i by i.Value into g
  where g.Count() == 2
  from m in Movies.Where(x => x.Guid == g.Key).DefaultIfEmpty()
  select m.Name;

SQL查询LINQ To SQL等效

2 个答案: