Implementing RANK OVER SQL Clause in C# LINQ
16,692
If you don't need the exact Rank semantics (i.e. tied ranks). You can use the index available with select projections
var rank = data.GroupBy(d => d.CategoryKey)
.SelectMany(g => g.OrderByDescending(y => y.Rate * @BAES_RATE)
.Select((x,i) => new{g.Key, Item=x, Rank=i+1}))
Otherwise you can look at this answer
Author by
Admin
Updated on June 04, 2022Comments
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Admin about 2 years
I need to implement the following T-SQL clause ....
RANK() OVER (PARTITION BY a.CategoryKey ORDER BY (x.Rate * @BASE_RATE ) DESC )as Rank
...in C# LINQ. So far what I've come up with is something like ....
var rank = data.GroupBy(d => d.CategoryKey) .Select(group => group.OrderByDescending(g => g.Rate * @BAES_RATE)
I think this would give me each rank partition ordered by rate * BASE_RATE. But what I actually need is the individual rank of a single row, with this being a subquery within a larger result. So really the full SQL query I'm working from is something like ....
SELECT a.Rate, a.CategoryKey, a.ID, . . . RANK() OVER (PARTITION BY a.CategoryKey ORDER BY (x.Rate * @BASE_RATE ) DESC )as Rank FROM data
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Admin over 10 yearsCool thanks, I figured out the answer but this works too
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Frank Tzanabetis over 8 years@MassStrike Care to share your implementation?