MySQL，PHP，GROUP中有多少个

Question

我正在尝试创建一个表格，用于输出用户列表以及他们登录的次数。

每次有人登录时都会创建表中的新行，因此一个用户有多行。

现在，我正在尝试使用以下语句来提取数据：

SELECT * FROM logins GROUP BY user ORDER BY timestamp DESC

哪个工作正常，但现在我的HTML表格中有一列应显示用户登录的次数。如何计算每组中的行数？

Answer 1

试试这个：

SELECT *, COUNT(*) AS count FROM logins GROUP BY user ORDER BY timestamp DESC

Answer 2

SELECT user, count(timestamp) as login_count 
FROM logins
GROUP BY user
ORDER BY login_count DESC

以按登录次数命令用户

Answer 3

使用count（）...... 试试这个

SELECT *, COUNT(*) as totalcounts FROM logins GROUP BY user ORDER BY timestamp DESC

COUNT（）函数返回与指定条件匹配的行数。

Answer 4

SELECT user,count(*) as NoOfTimes
 FROM logins 
GROUP BY user 
ORDER BY timestamp DESC

Answer 5

使用COUNT：

SELECT user, COUNT(user) 'How Many Times he logged in'
FROM logins 
GROUP BY user 
ORDER BY timestamp DESC