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List the name of employees within a given age range

RealWork asked:

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I have to list the names of the employees who fall within a given age range. I am new in learning to use variables/parameters in SQL, and I am having a hard time to get an output.

I don't know how to set a variable so a user can enter a age range and then get the names of the employees who fall within that range.

I am getting this error when I run this query

Incorrect syntax near the keyword 'with'. If this statement is a common table expression, an xmlnamespaces clause or a change tracking context clause, the previous statement must be terminated with a semicolon.
Msg 102, Level 15, State 1, Line 72

What I have tried:

Declare @AgeRange int
Set @AgeRange = DATEDIFF(YEAR, '1946-06-08', GETDATE()) 

WITH AgeData as 
    SELECT FirstName, LastName,
    FROM ptWMember as wm
    JOIN ptWorkingCertification as wc on wc.PK = wm.fkptWCertification
  GroupAge AS
  SELECT FirstName, LastName,
             WHEN @AgeRange < 30 THEN 'Under 30'
             WHEN @AgeRange BETWEEN 31 AND 40 THEN '31 - 40'
             WHEN @AgeRange BETWEEN 41 AND 50 THEN '41 - 50'
             WHEN @AgeRange > 50 THEN 'Over 50'
             ELSE 'Invalid Birthdate'
         END AS [Age Groups]
  FROM AgeData
SELECT FirstName, LastName
FROM AgeData
Tags: SQL, SQL-Server


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