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    4D v13.4
 4d_language_reference 
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A 4d_language_reference argument specifies the 4D variable or field name (sql_name) to which data will be assigned. This name can be passed in one of the following manners:
<<sql_name>>
<<$sql_name>> (*)
 <<[sql_name]sql_name>> (corresponds  to the standard 4D syntax: [TableName]FieldName)
:sql_name
:$sql_name  (*)
 :sql_name.sql_name (corresponds to  the standard SQL syntax: TableName.FieldName)
(*) In compiled mode, you cannot use references to local variables (beginning with the $ symbol).
	Product:  4D
	Theme:  Syntax rules
	
        
        
	
Accessing the 4D SQL Engine
SELECT
sql_name