sql server 2008 - sql Alias Column Name for Use in CASE Statement -

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I have an SQL query as below, 

  selected site, data source, (as select case when data source = 'RFQ' then 'ChangeOperator' balance 'SameOperator' end) OperatorScenario, the (select case OperatorScenario = 'ChangeOperator' then '1' Balance '022' end) OperatorScenario2 As tablename  
 in the form when I execute this query, I get an exception in the form of invalid column name operator scanner, As tried by using a code in the other name in the second query,  
  (if you choose the case 'OperatorScenario' = 'ChangeOperator' then '1' remaining '022' end) As OperatorScenario2   
 Then it always implements the other part. Please give me some tips related sangeet   
 
 
 The main issue is that you do not reference the nickname in the same query Can give Also you have brackets and an additional  SELECT  keyword, which looks like a subclass where I do not believe you have one intention (you have  FROM  Do not block. / P> 
 You can copy the whole thing again (either fixing your query in the process):  
  select site, data source, case When the data source = 'RFQ' then 'ChangeOperator' remaining 'Saooperator' and SS Operator SACNRI case Switch to in case when Datasors = 'RFQ' then 'Chenjropretr' Aelsi 'Saoopretr "end =" Chenjropretr' and '1' Ielsi as '022' Eddie the Tablenm from Opretrssenario 2   
 Or, to simplify:  
  select site, data source, case when the data source = 'rfQ' then 'ChangeOperator' remaining 'SameOperator' end operatorScenario, as the case when the data Source = 'RFQ' then '1' remaining '022' from Tablename  as END OperatorScenario2  
 
 or a CTE (again Use query fixing):  
  Select (site with CTE, Detasors case when Datasors = so 'RFQ' Chenjopretr 'EL SA' Saoopretr 'and SAS operator Sisanario, select Tablenem) site, Detasors operator Sisanario when Opretrsenario = 'Chenjropretr' and '1' Els '022' CT operator Senario 2 as Eddie

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