MySQL选择要获取今天登录的用户？
要使用户今天登录，请使用以下语法。在这里，我们期望您的datetime字段是字符串类型-
select yourColumnName1,yourColumnName2,yourColumnName3,...N from youTableName WHERE STR_TO_DATE(yourColumnName1, ‘format’') =CURDATE();
假设我们有以下“DateEqualToday”表，该表存储用户的名字和姓氏以及登录日期-
+------+------------+-----------+------------+ | Id | First_Name | Last_Name | LoginDate | +------+------------+-----------+------------+ | 1 | James | Smith | 20-12-2018 | | 2 | Carol | Taylor | 21-12-2017 | | 3 | John | Smith | 21-12-2018 | | 4 | Maria | Garcia | 22-12-2018 | | 5 | Mike | Davis | 21-12-2018 | | 6 | Bob | Wilson | 21-12-2018 | +------+------------+-----------+------------+ 6 rows in set (0.00 sec)
这是用于过滤今天哪些用户登录的查询。在此查询中，将您的日期与curdate()函数进行比较，因为curdate()仅给出当前日期-
mysql> select Id,First_Name,LoginDate -> from DateEqualToday WHERE STR_TO_DATE(LoginDate, '%d-%m-%Y') =CURDATE();
输出结果
+------+------------+------------+ | Id | First_Name | LoginDate | +------+------------+------------+ | 3 | John | 21-12-2018 | | 5 | Mike | 21-12-2018 | | 6 | Bob | 21-12-2018 | +------+------------+------------+ 3 rows in set (0.00 sec)