按時間獲取預訂

Question

我有一個MySQL的問題，我試圖獲得所有的預訂，其中開始時間大於'16：42'但小於'18：42'。我試過這個，但是當我用'15：42'而不是'16：42'時，我仍然得到了同樣的結果。

SELECT  * 
FROM  `tables` 
INNER JOIN reservation_table 
ON   `tables`.`id` = reservation_table.table_id 
INNER JOIN reservations 
ON   reservations.id = reservation_table.reservation_id 
INNER JOIN customers 
ON   customers.id = reservations.customer_id 
WHERE `date` = '2016-11-02' 
    AND (starttime <= '19:42' 
     AND starttime >= '16:42') 

Answer 1

可能是你有一些轉換的問題..嘗試使用一個明確的轉換

SELECT  * 
FROM  `tables` 
INNER JOIN reservation_table 
ON   `tables`.`id` = reservation_table.table_id 
INNER JOIN reservations 
ON   reservations.id = reservation_table.reservation_id 
INNER JOIN customers 
ON   customers.id = reservations.customer_id 
WHERE `date` = '2016-11-02' 
    AND (starttime <= str_to_date('19:42', '%H:%i') 
     AND starttime >= str_to_date('16:42' , '%H:%i')) 

Answer 2

如果starttime和endtime列是TIME格式那麼該查詢應該解決您的問題：

因爲mysql文檔說「如果NO_ ZERO_DATE或NO_ZERO_IN_DATE啓用SQL模式，不允許零日期或部分日期。「您可能需要執行這個查詢第一：

SET sql_mode = ''; 

然後第二個（如果開始時間和結束時間列在時間格式）：

SELECT  * 
FROM  `tables` 
INNER JOIN reservation_table 
ON   `tables`.`id` = reservation_table.table_id 
INNER JOIN reservations 
ON   reservations.id = reservation_table.reservation_id 
INNER JOIN customers 
ON   customers.id = reservations.customer_id 
WHERE `date` = '2016-11-02' 
AND (starttime <= str_to_date('19:42', '%H:%i') 
    AND starttime >= str_to_date('16:42' , '%H:%i')) 

，但如果這些列不是該格式做：

SELECT  * 
FROM  `tables` 
INNER JOIN reservation_table 
ON   `tables`.`id` = reservation_table.table_id 
INNER JOIN reservations 
ON   reservations.id = reservation_table.reservation_id 
INNER JOIN customers 
ON   customers.id = reservations.customer_id 
WHERE `date` = '2016-11-02' 
AND (str_to_date(starttime, '%H:%i') <= str_to_date('19:42', '%H:%i') 
    AND str_to_date(starttime, '%H:%i') >= str_to_date('16:42' , '%H:%i'))