Question

SELECT 
  * 
FROM
  (`users`) 
  JOIN `artistprofiles` AS art 
    ON `art`.`user_id` = `users`.`id` 
WHERE WEEKDAY(users.date_created) = 'WEEKDAY(WEEKDAY(NOW()))' 
  AND `users`.`status_enum` = 'aproved' 
  AND `users`.`status` = 1 
ORDER BY `users`.`email_process` DESC

此查询有什么问题。它给了我错误的结果

Answer 1

试试这样：

SELECT * FROM (`users`) JOIN `artistprofiles` AS art ON `art`.`user_id` = `users`.`id` WHERE WEEKDAY(users.date_created) = WEEKDAY(NOW()) AND `users`.`status_enum` = 'aproved' AND `users`.`status` = 1 ORDER BY `users`.`email_process` desc

'使其成为一个字符串。所以你没有得到工作日。

您可能需要阅读此内容：When to use single quotes, double quotes, and backticks in MySQL

Answer 2

这是错误的：

WHERE WEEKDAY(users.date_created) = 'WEEKDAY(WEEKDAY(NOW()))'

示例：

select 
    @wd:=WEEKDAY(curdate()) wd, 
    @str:='WEEKDAY(WEEKDAY(NOW()))' str, 
    @wd=@str,
    @wd=WEEKDAY( now() ) ;

结果：

+------+-------------------------+----------+----------------------+
| wd   | str                     | @wd=@str | @wd=WEEKDAY( now() ) |
+------+-------------------------+----------+----------------------+
|    2 | WEEKDAY(WEEKDAY(NOW())) |        0 |                    1 |
+------+-------------------------+----------+----------------------+

在您的查询中，您将工作日值与文字字符串'WEEKDAY(WEEKDAY(NOW()))'进行比较。由于它们不匹配，它会返回 false ，因此您会看到错误的结果。

要检查列的工作日是否为现在的工作日，那么

更改：

WHERE WEEKDAY(users.date_created) = 'WEEKDAY(WEEKDAY(NOW()))'

要：

WHERE WEEKDAY(users.date_created) = WEEKDAY( NOW() )

工作日（日期）与工作日的当前日期进行比较

2 个答案: