每月如何获得总计？

Question

I'm doing the dashboard for our system. I want to add a bar graph which displays the total transaction every month from January to December this year. Can somebody help me with my problem? This is my query.

  SELECT tbl_barangay.barangay_name, 
   tbl_transaction_details.supplier_medicine_id, 
   tbl_supplier_medicine.medicine_name, 
   SUM(tbl_transaction_details.total_price) as 'Total' 
  FROM 
   tbl_transaction_details 
  INNER JOIN 
   tbl_supplier_medicine ON tbl_transaction_details.supplier_medicine_id = 
   tbl_supplier_medicine.supplier_medicine_id 
  INNER JOIN 
   tbl_transaction ON tbl_transaction.transaction_id = 
   tbl_transaction_details.transaction_id
  INNER JOIN 
   tbl_barangay ON tbl_barangay.barangay_id = tbl_transaction.barangay_id 
  WHERE 
   tbl_barangay.barangay_id = 1 
  AND 
   tbl_transaction.transaction_date BETWEEN "2019-08-18" AND "2019-08-18"
  GROUP BY
   tbl_transaction_details.supplier_medicine_id

Answer 1

I don't know your database schema well but can you please look into this line?

tbl_transaction.transaction_date BETWEEN "2019-08-18" AND "2019-08-18"

I think this is one of the reasons that are causing problems because the transaction date is not selecting the whole year dates.

Also, the GROUP BY clause should contain all columns except the aggregation columns. So, the GROUP BY clause should be like this,

GROUP BY
   tbl_barangay.barangay_name, 
   tbl_transaction_details.supplier_medicine_id, 
   tbl_supplier_medicine.medicine_name

Hope, this helps. Thanks.