erhalten Summen nach Jahr, wenn Rechnungen in beiden Jahren existieren

Question

Also ich suche nach Gesamtrechnungen pro Kunde, wo eine Rechnung in beiden Jahren existiert. So habe ich

SELECT  Sum((tbl_invoice_details.quantity 
       - ifnull(tbl_invoice_details.quantity_returned, 0) 
       ) * tbl_invoice_details.price) AS dollarsSold, 
      tbl_customers.NAME, 
      cust_ID AS customer_id, 
      YEAR (tbl_invoice.invoice_date) AS invoiceYear 
FROM  `tbl_invoice_details` 
INNER JOIN `tbl_invoice` 
ON   `tbl_invoice_details`.`invoice_ID` = `tbl_invoice`.`invoice_ID` 
INNER JOIN `tbl_customers` 
ON   `tbl_customers`.`customer_ID` = `tbl_invoice`.`cust_ID` 
WHERE  MONTH (`invoice_date`) = '2' 
AND  (YEAR (`invoice_date`) = '2017' 
      OR 
      YEAR (`invoice_date`) = '2016') 
AND EXISTS (SELECT * 
      FROM tbl_invoice 
      WHERE cust_ID = customer_id 
      AND MONTH (`invoice_date`) = '2' 
      AND YEAR (`invoice_date`) = '2016') 
GROUP BY MONTH (tbl_invoice.invoice_date), 
      invoiceYear, 
      `tbl_customers`.`name`, 
      customer_id 
ORDER BY name 

So wie ich es Kunden beschränken, die sowohl eine Rechnung im Februar 2016 haben und 2017. Ich versuchte es mit den EXISTS aber das ist nur halb erfolgreich.

Answer 1

Der beste Weg, um sicherzustellen, dass beide Rechnungen vorhanden ist, besteht, wird mit zweimal, eine für 2016 und andere für 2017.

SELECT  Sum((tbl_invoice_details.quantity 
       - ifnull(tbl_invoice_details.quantity_returned, 0) 
       ) * tbl_invoice_details.price) AS dollarsSold, 
      tbl_customers.NAME, 
      cust_ID AS customer_id, 
      YEAR (tbl_invoice.invoice_date) AS invoiceYear 
FROM  `tbl_invoice_details` 
INNER JOIN `tbl_invoice` 
ON   `tbl_invoice_details`.`invoice_ID` = `tbl_invoice`.`invoice_ID` 
INNER JOIN `tbl_customers` 
ON   `tbl_customers`.`customer_ID` = `tbl_invoice`.`cust_ID` 
WHERE  MONTH (`invoice_date`) = '2' 
AND  YEAR (`invoice_date`) IN ('2016', '2017') 
AND EXISTS (SELECT 1 
      FROM tbl_invoice 
      WHERE cust_ID = customer_id 
      AND MONTH (`invoice_date`) = '2' 
      AND YEAR (`invoice_date`) = '2016') 
AND EXISTS (SELECT 1 
      FROM tbl_invoice 
      WHERE cust_ID = customer_id 
      AND MONTH (`invoice_date`) = '2' 
      AND YEAR (`invoice_date`) = '2017') 
GROUP BY MONTH (tbl_invoice.invoice_date), 
      invoiceYear, 
      `tbl_customers`.`name`, 
      customer_id 
ORDER BY name;