sql - using a searched case in where condition -

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I have recently got this stored procedure where it is using a markmark code called variable called

< P> In my selected statement, I would like to receive every market except Southern if the application passes futile. 

  and marketcode =! 'South'

If someone passes an unnecessary value, then I will use one instead. 

  and marketCode = 'North'

How can I join one in both of these? 

  AND marketCode = (case @marketcode when zero & lt; .. not equal to 'south' .. .. & gt; Other & lt; .. equal to 'south' (End.)    
 
 
 You can call it a  or  The condition should be able to be accompanied by: 
 
  ... AND ((@marketcode is tap & marketcode & lt; & gt; 'south') or (@markcod not faucet and marketcode = @marketcode))

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