mysql - How to simplify this subquery? -

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i saw subquery http://www.programmerinterview.com/index.php/database-sql/derived-table-vs-subquery/ , has following subquery example, says written more simply. tell me how that? thank you!

a table called employee columns employee_name, last_name, employee_salary, , employee_number. want find employees have salary above average. 

   select employee_name      employee     employee_salary >     (select avg(employee_salary)             employee)

you can use over clause calculate average salary , if current employee's salary bigger it. unfortunatelly, window functions can not used in clause, should use comman table expression, too.

declare @employee table (      [employee_name] varchar(12)     ,[employee_salary] int )  insert @employee ([employee_name], [employee_salary]) values ('empl1', 100)       ,('empl2', 200)       ,('empl3', 300)       ,('empl4', 400)       ,('empl5', 500)       ,('empl6', 600)       ,('empl7', 700)       ,('empl8', 800)  -- query  select employee_name      @employee     employee_salary >     (select avg(employee_salary)             @employee)  -- alternative query ;with datasource (      select employee_name            ,employee_salary - avg(employee_salary) on () diff      @employee  )  select employee_name  datasource  diff > 0

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