Hoe in te checken in een andere tabel heeft geen gegevens tijdens het doen van mysql join?

Voeg IF-voorwaarde toe aan SQL-query, zoiets als dit.

SELECT invoice_details.invoice_no,
       invoice_details.invoice_date,
       invoice_details.invoice_amount,
       SUM(IF(received_amount_details.received_amount IS NULL
               OR received_amount_details.received_amount = '', 0.0,
               received_amount_details.received_amount)) AS totalreceiptamt
FROM   (SELECT DISTINCT invoice_no,
                        received_amount
        FROM   received_amount_details) AS received_amount_details
       right join invoice_details
               ON received_amount_details.invoice_no =
                  invoice_details.invoice_no
WHERE  invoice_details.proje_id = '7'
GROUP  BY invoice_details.invoice_no 

Dit voegt 0,0 toe aangezien de standaardwaarde niet Received_amount_details is.received_amount IS NULL of leeg

We doen ook goed mee te doen om alle waarden van de pagina factuur_details te krijgen.

U kunt hier meer leren over de IF-conditie in MYSQL,

https://www.w3schools.com/mysql/func_mysql_if.asp https://dev.mysql.com/doc/refman/8.0 /en/if.html