C# 中 IEnumerable 和 IQueryable 有什麼差別？

dbContext dc = new dbContext ();
IEnumerable
<SocialMedia>
list = dc.SocialMedias.Where(p => p.Name.StartsWith("T"));
list = list.Take<SocialMedia>(1);
</SocialMedia>

SELECT [t0].[ID], [t0].[Name] FROM [SocialMedia] AS [t0]
WHERE [t0].[Name] LIKE @p0

dbContext dc = new dbContext ();
IQueryable<SocialMedia> list = dc.SocialMedias.Where(p => p.Name.StartsWith("T"));
list = list.Take<SocialMedia>(1);

SELECT top 1 [t0].[ID], [t0].[Name] FROM [SocialMedia] AS [t0]
WHERE [t0].[Name] LIKE @p0