mysql日期补全

前提:订单表,有的日期没有订单,但是也要查询出来,并分页

查询order表中2017-10-01  ----2017-10-31 已10 分页 查询出每天的订单数,没有的补0

 

SELECT
    od.date,
    od.orderCount
FROM
    (
        SELECT
            count(*) orderCount,
            DATE_FORMAT(order_time, '%Y-%m-%d') date
        FROM
            order_info
        WHERE
            order_time > '2017-10-1'
        AND order_time < '2017-10-31'
        GROUP BY
            DATE_FORMAT(order_time, '%Y-%m-%d')
        UNION    (SELECT 0, '2017-10-01')
        UNION    (SELECT 0, '2017-10-02')
        UNION    (SELECT 0, '2017-10-03')
        UNION    (SELECT 0, '2017-10-04')
        UNION    (SELECT 0, '2017-10-05')
        UNION    (SELECT 0, '2017-10-06')
        UNION    (SELECT 0, '2017-10-07')
        UNION    (SELECT 0, '2017-10-08')
        UNION    (SELECT 0, '2017-10-09')
        UNION    (SELECT 0, '2017-10-10')
        UNION    (SELECT 0, '2017-10-11')
        UNION    (SELECT 0, '2017-10-12')
        UNION    (SELECT 0, '2017-10-13')
        UNION    (SELECT 0, '2017-10-14')
        UNION    (SELECT 0, '2017-10-15')
        UNION    (SELECT 0, '2017-10-16')
        UNION    (SELECT 0, '2017-10-17')
        UNION    (SELECT 0, '2017-10-18')
        UNION    (SELECT 0, '2017-10-19')
        UNION    (SELECT 0, '2017-10-20')
        UNION    (SELECT 0, '2017-10-21')
        UNION    (SELECT 0, '2017-10-22')
        UNION    (SELECT 0, '2017-10-23')
        UNION    (SELECT 0, '2017-10-24')
        UNION    (SELECT 0, '2017-10-25')
        UNION    (SELECT 0, '2017-10-26')
        UNION    (SELECT 0, '2017-10-27')
        UNION    (SELECT 0, '2017-10-28')
        UNION    (SELECT 0, '2017-10-29')
        UNION    (SELECT 0, '2017-10-30')
        UNION    (SELECT 0, '2017-10-31')
    ) AS od
LIMIT 10,10