我曾尝试使用distinct(),还有一些可查询下面的代码peice的:LINQ的鲜明SQL Statementet
var finalWhere = Expression.Lambda<Func<Data.DataModel.TrialSummary, bool>>(containsMethod, parameter);
queryableTrialSummary = queryableTrialSummary.Where(finalWhere).Distinct();
var trials = queryableTrialSummary.Select(x => x.Trial_Code).Distinct();
但我发现,生成了不同的SQL语句如下;
SELECT
[Distinct1].[Trial_Code] AS [Trial_Code]
FROM (SELECT DISTINCT
[Extent1].[Trial_Code] AS [Trial_Code]
FROM [OBAR].[TrialSummary] AS [Extent1]
WHERE [Extent1].[Trial_MasterProtocolId] IN (N'15NOPEPYT512')
) AS [Distinct1]
我的问题是:为什么在上面的SQL语句中有两个select语句,一个inner和一个outer。
难道我做错了什么,因为我觉得这应该产生什么错在这里,因为我觉得这应该产生的SQL语句如下
SELECT DISTINCT
[Extent1].[Trial_Code] AS [Trial_Code]
FROM [OBAR].[TrialSummary] AS [Extent1]
WHERE [Extent1].[Trial_MasterProtocolId] IN (N'15NOPEPYT512')
能否请你帮忙。
@ user3494319我有没有回答你的问题或没有? – Ryan