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Top n Using Scalar Subqueries

Top n

Top n Using Scalar Subqueries

by  MalcolmW  Posted    (Edited  )
Code: 
SELECT (SELECT MAX (Salary)
          FROM Employees) AS S1,
       (SELECT MAX (Salary)
          FROM Employees
         WHERE Salary NOT IN (S1)) AS S2,
       (SELECT MAX (Salary)
          FROM Employees
         WHERE Salary NOT IN (S1, S2)) AS S3,
           ...
       (SELECT MAX (Salary)
          FROM Employees
         WHERE Salary NOT IN (S1, S2, ... S[n-1])) AS Sn
FROM DummyTable
DummyTable can be any existing table, empty or not.
This example is from SQL For Smarties, by Joe Celko. In return for stealing his example, I will plug his book as excellent reference for SQL.
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