SQL query with case datepart -

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i data exclude weekends result based on bind variable value. somehow not able query run. 

select *  tablename a.date >= '2015-04-13' , a.date <= '2015-04-21' , case  when :1 = 'y' ((datepart(dw, a.date) + @@datefirst) % 7) not in (0, 1) end

i getting following error : incorrect syntax near keyword 'not'.

use case expression here over-complicates things, imho. have 2 situations:

  1. if bind variables y, need exclude weekends.
  2. if isn't, want include them.

this logic can achieved simpler (again, imho) usage of or logical operator:

select *   tablename  a.date >= '2015-04-13' ,         a.date <= '2015-04-21' ,        (:1 != 'y' or ((datepart(dw, a.date) + @@datefirst) % 7) not in (0, 1))

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