how to write group by query in sql server

Hi LPriyanka ,

You can modify your query to include the frequency column by adding it to the select statement and the group by clause.

Here's an example query:

SELECT 
  t1.sales_id, 
  t1.customer_id, 
  COALESCE(t2.sales_amount, null) AS amount, 
  t2.frequency 
FROM 
  table1 t1 
  LEFT JOIN (
    SELECT 
      sales_id, 
      MAX(sales_amount) AS sales_amount, 
      frequency 
    FROM 
      table2 
    GROUP BY 
      sales_id, 
      frequency
  ) t2 ON t2.sales_id = t1.sales_id 
GROUP BY 
  t1.customer_id, 
  t1.sales_id, 
  t2.frequency

Best Regards,

Jianbo Li

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