Bagaimana untuk Mendapatkan Transaksi 7 Hari Terakhir dengan Baris Kosong dalam Jadual MySQL Tunggal?

Mendapatkan semula Transaksi 7 Hari Terakhir dan Termasuk Baris Kosong dalam Jadual Tunggal MySQL

Untuk menangani cabaran mengekstrak transaksi 7 hari terakhir dan menangkap baris kosong daripada pangkalan data MySQL, kami akan merentasi perkara berikut pendekatan:

1. Jana Julat Tarikh:
   Kami mulakan dengan membuat senarai tarikh yang merangkumi tujuh hari sebelumnya menggunakan pertanyaan berikut:

   select DATE_FORMAT(a.Date,'%Y-%m-%d') as purchase_date,
   '0' as  amount
   from (
      select curdate() - INTERVAL (a.a + (10 * b.a) + (100 * c.a)) DAY as Date
      from (select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as a
      cross join (select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as b
      cross join (select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as c
   ) a
   where a.Date BETWEEN NOW() - INTERVAL 7 DAY AND NOW()

2. Sertai dengan Transaksi Jadual:
   Seterusnya, kami menyertai senarai tarikh yang dijana ini dengan jadual transaksi untuk mendapatkan jumlah jualan yang sepadan, jika ada:

   SELECT t1.purchase_date,
   coalesce(SUM(t1.amount+t2.amount), 0) AS amount
   from

   (
     select DATE_FORMAT(a.Date,'%Y-%m-%d') as purchase_date,
     '0' as  amount
     from (
        select curdate() - INTERVAL (a.a + (10 * b.a) + (100 * c.a)) DAY as Date
        from (select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as a
        cross join (select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as b
        cross join (select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as c
     ) a
     where a.Date BETWEEN NOW() - INTERVAL 7 DAY AND NOW()
   )t1
   left join

   (
     SELECT DATE_FORMAT(purchase_date, '%Y-%m-%d') as purchase_date,
     coalesce(SUM(amount), 0) AS amount
     FROM transactions
     WHERE purchase_date BETWEEN NOW() - INTERVAL 7 DAY AND NOW()
     AND vendor_id = 0
     GROUP BY purchase_date
   )t2
   on t2.purchase_date = t1.purchase_date
   group by t1.purchase_date
   order by t1.purchase_date desc

Pertanyaan Penuh:

select 
t1.purchase_date,
coalesce(SUM(t1.amount+t2.amount), 0) AS amount
from
(
  select DATE_FORMAT(a.Date,'%Y-%m-%d') as purchase_date,
  '0' as  amount
  from (
    select curdate() - INTERVAL (a.a + (10 * b.a) + (100 * c.a)) DAY as Date
    from (select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as a
    cross join (select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as b
    cross join (select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as c
  ) a
  where a.Date BETWEEN NOW() - INTERVAL 7 DAY AND NOW()
)t1
left join
(
  SELECT DATE_FORMAT(purchase_date, '%Y-%m-%d') as purchase_date,
  coalesce(SUM(amount), 0) AS amount
  FROM transactions
  WHERE purchase_date BETWEEN NOW() - INTERVAL 7 DAY AND NOW()
  AND vendor_id = 0
  GROUP BY purchase_date
)t2
on t2.purchase_date = t1.purchase_date
group by t1.purchase_date
order by t1.purchase_date desc

Menggunakan pertanyaan komprehensif ini, kami boleh mengekstrak jumlah jualan untuk setiap tujuh hari terakhir, dengan berkesan termasuk baris kosong untuk hari tanpa transaksi.

Atas ialah kandungan terperinci Bagaimana untuk Mendapatkan Transaksi 7 Hari Terakhir dengan Baris Kosong dalam Jadual MySQL Tunggal?. Untuk maklumat lanjut, sila ikut artikel berkaitan lain di laman web China PHP!