SWQL and Declare Variables be used

Can declare variables be used in SWQL. 

Snippit example Example:

DECLARE @BSvar VARCHAR(MAX)
SET @BSvar = 'CLAS'
SELECT Count 
 (N.Caption) As Value 
 ,N.IOSVersion AS OS
FROM Orion.Nodes N
WHERE ( 
 N.MachineType LIKE '%RED%'
 AND N.IOSVersion LIKE '%Red%5.%'
AND N.CustomProperties.business_system = '@BSvar'
 )
 UNION
 (SELECT Count 
 (N.Caption) As Value 
 ,N.IOSVersion AS OS
FROM Orion.Nodes N
WHERE ( 
 N.MachineType LIKE '%RED%'
 AND N.IOSVersion LIKE '%Red%6.%'
AND N.CustomProperties.business_system = '@BSvar'
 )
 )

End snipped