什麼是這個MySQL加入查詢

Question

我有一個休息和clock_in_out表，我想從兩者獲取所有值，並將其加入到他們的user_id列中。但我越來越不正確synatx使用JOIN附近ON，不知道爲什麼。這裏是我的查詢

SELECT * 
FROM `breaks` 
WHERE `user_id` = 1 
AND `in_date` LIKE '%2015-03-03%' 
AND `out_date` LIKE '%2015-03-03%' 
JOIN `clock_in_out` ON `breaks`.`user_id` = `clock_in_out`.`user_id` 
WHERE `loggedin_date` 
LIKE '%2015-03-03%' 
AND `loggedout_date` LIKE '%2015-03-03%' 

Answer 1

您不能混用WHERE和JOIN這樣的子句。訂單是：SELECT,FROM,JOIN,WHERE,GROUP BY,HAVING,LIMIT。因此它應該是：

SELECT * 
FROM `breaks` 
JOIN `clock_in_out` ON `breaks`.`user_id` = `clock_in_out`.`user_id` 
WHERE `user_id` = 1 
AND `in_date` LIKE '%2015-03-03%' 
AND `out_date` LIKE '%2015-03-03%' 
AND `loggedin_date` LIKE '%2015-03-03%' 
AND `loggedout_date` LIKE '%2015-03-03%' 

有關完整的語法，請參閱MySQL documentation。

Answer 2

WHERE條款應JOIN後：

SELECT * 
FROM `breaks` JOIN 
    `clock_in_out` ON `breaks`.`user_id` = `clock_in_out`.`user_id` 
WHERE `user_id` = 1 
    AND `in_date` LIKE '%2015-03-03%' 
    AND `out_date` LIKE '%2015-03-03%' 
    AND `loggedin_date` LIKE '%2015-03-03%' 
    AND `loggedout_date` LIKE '%2015-03-03%' 

Answer 3

您的語法錯誤。對於加入正確的語法是Select ... from .. join ... on ... where

SELECT * 
FROM `breaks` 
JOIN `clock_in_out` ON `breaks`.`user_id` = `clock_in_out`.`user_id` 
WHERE `loggedin_date` 
LIKE '%2015-03-03%' 
AND `loggedout_date` LIKE '%2015-03-03%' 
AND `user_id` = 1 
AND `in_date` LIKE '%2015-03-03%' 
AND `out_date` LIKE '%2015-03-03%' 

Answer 4

對於這個正確的語法如下

SELECT * 
FROM `breaks` 
JOIN `clock_in_out` ON `breaks`.`user_id` = `clock_in_out`.`user_id` 
WHERE `user_id` = 1 
AND `in_date` LIKE '%2015-03-03%' 
AND `out_date` LIKE '%2015-03-03%' 
AND `loggedin_date` LIKE '%2015-03-03%' 
AND `loggedout_date` LIKE '%2015-03-03%