獲取 MySQL 數據庫中每月的條目數

Question

我有一個帶有兩列預訂的 MySQL 數據庫：

BookingDate (datetime)
Status (varchar with the values of Confirmed, Open, Unconfirmed, Closed, Canceled)

我想計算每個月狀態為 Closed、Open 或 Confirmed 的條目數。 稍后我將使用 PHP 將這些數據導出到圖表中，因此我需要將其傳遞到數組中。

在 MySQL 中執行此操作的最佳方法是什么？ 我希望結果如下所示：

mm/yy -> # of entires

Answer 1

考慮：

select date_format(booking_date, '%m/%y'), count(*) nb_entries
from mytable
where status in ('Closed', 'Open', 'Confirmed')
group by year(booking_date), month(booking_date), date_format(booking_date, '%m/%y')
order by year(booking_date), month(booking_date)

如果您想要每個狀態一列，則：

select 
    date_format(booking_date, '%m/%y'), 
    count(*) nb_entries,
    sum(status = 'Closed') nb_entries_closed,
    sum(status = 'Open') nb_entries_open,
    sum(status = 'Confirmed') nb_entries_confirmed
from mytable
where status in ('Closed', 'Open', 'Confirmed')
group by year(booking_date), month(booking_date), date_format(booking_date, '%m/%y')
order by year(booking_date), month(booking_date)

Answer 2

SELECT DATE_FORMAT(booking_date, '%m/%y') `month and year`, 
       SUM(status IN ('Closed', 'Open', 'Confirmed')) `# of entires`
FROM `booking reservations`
-- WHERE city = 'LA'
GROUP BY DATE_FORMAT(booking_date, '%m/%y')