pengelompokan mysql berdasarkan minggu

Jika Anda menyimpan the_date sebagai integer, Anda harus terlebih dahulu mengonversinya menjadi datetime menggunakan FROM_UNIXTIME fungsi:

 SELECT SUM(`amount_sale`) as total 
FROM `sales` 
WHERE `payment_type` = 'Account' 
GROUP BY WEEK(FROM_UNIXTIME(`the_date`))  

PERBARUI :
Juga, Anda mungkin ingin menampilkan nomor minggu,

SELECT CONCAT('Week ', WEEK(FROM_UNIXTIME(`the_date`))) as week_number,
SUM(`amount_sale`) as total 
FROM `sales` 
WHERE `payment_type` = 'Account' 
GROUP BY WEEK(FROM_UNIXTIME(`the_date`))