GROUP BY (Azure Stream Analytics)

Groups a selected set of rows into a set of summary rows by the values of one or more columns or expressions. One row is returned for each group. Aggregate functions in the SELECT clause’s <select> list provide information about each group instead of individual rows.


GROUP BY <group by spec>  
<group by spec> ::=  
    <group by item> [ ,...n ]  
    | <window_type> | System.Timestamp()  
<group by item> ::=  

Either <window_type> or System.Timestamp() is required, <group by item> is optional. <window_type> and a sequence of <group by items> can appear in any order.



Specifies any Azure Stream Analytics supported Windowing. See Windowing (Azure Stream Analytics).

< column_expression >

Is the expression or the name of the column on which the grouping operation is performed. The column expression cannot contain a column alias that is defined in the SELECT list.


SELECT TollId, System.Timestamp() AS WinEndTime, COUNT(*)   
FROM TollTagEntry TIMESTAMP BY EntryTime  
GROUP BY TumblingWindow( minute , 3 ) , TollId  

See Also