Linq中包含查詢

//Linq程式碼：
T_WxMaterials.Where(n=>T_VideoMsgs.Select(m=>m.MediaID).Contains(n.MediaID)) 

//生成的sql語句:
SELECT [t0].[ID], [t0].[Type], [t0].[Title], [t0].[Cnt], [t0].[MediaID], [t0].[LocalPath], [t0].[WxPath]
FROM [T_WxMaterial] AS [t0]
WHERE EXISTS(
    SELECT NULL AS [EMPTY]
    FROM [T_VideoMsg] AS
 
 [t1]
    WHERE [t1].[MediaID] = [t0].[MediaID]
    )

Linq中不包含查詢

//Linq程式碼：
T_WxMaterials.Where(n=>!T_VideoMsgs.Select(m=>m.MediaID).Contains(n.MediaID)) 

//生成的sql語句:
SELECT [t0].[ID], [t0].[Type], [t0].[Title], [t0].[Cnt], [t0].[MediaID], [t0].[LocalPath], [t0].[WxPath]
FROM [T_WxMaterial] AS [t0]
WHERE
 
 NOT (EXISTS(
    SELECT NULL AS [EMPTY]
    FROM [T_VideoMsg] AS [t1]
    WHERE [t1].[MediaID] = [t0].[MediaID]
    ))