Question

我正在处理一个查询，该查询要显示即将到来的日期数。即使日期大于当前日期，以下查询也会返回0。请帮我解决这个问题。

SELECT  (case when b.booked_date > cast(now() as date) then sum(1) else sum(0) end) as upcoming_booked_facilities                           
        from    svk_apt_book_facilities b   
        where   b.customer_id = 1
                and b.association_id = 1        
                and b.is_active = 1
        group   by b.facility_id

Answer 1

您需要对CASE表达式求和以进行条件聚合：

SELECT
    facility_id,
    SUM(CASE WHEN booked_date > CURDATE() THEN 1 ELSE 0 END) AS upcoming_booked_facilities
FROM svk_apt_book_facilities  
WHERE
    customer_id = 1    AND
    association_id = 1 AND
    is_active = 1
GROUP BY
    facility_id;

您试图将总和用作CASE表达式的谓词，这可能不是您想要的。请注意，由于您要按该列分组，因此我也选择了facility_id。如果您想在整个表格中使用条件总和，则不要按功能选择或分组。

MySQL'大于（>）'查询始终返回0

1 个答案: