Basic SQL Syntax Select [number] -

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I am working in a formatted search with SAP business and running in some syntax I have not come already This is probably very basic but can someone please shed some light on this? Ignore $ [System Objects]. 

  DECLARE @ guardian nVarChar (15) SET @parent = (SELECT T0.FNum OACT T0 WHERE T0.ACode = $ [DLN1.ACode])   
   
 The entire query does not currently work, Leck And my question is, what happens usually "select 21" or "choose 41" or "select 51" or XXX number? Does anyone provide me an example that will help me understand?  
 thanks   
 
 
 select [VALUE] will return only one value  
  Oracle:   
  double   
  Select from SQL Server 'Hello'   
  choose 'hello'   
 So what are your codes seems to be setting / displaying a value, and nothing  
 An example of another method that you can use, many items in a selectively:  
  
 It works in both SQL Server and Oracle, dual key Vshykta not.

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