具有自定义限制的Mysql计数

Question

我正在撰写报告，我的数据如下：

text    date                    text    date
a       18/01/2016 12:01        a       18/01/2016 13:01
b       18/01/2016 12:01        b       18/01/2016 13:01
c       18/01/2016 12:01        c       18/01/2016 13:01
d       18/01/2016 12:01        x       18/01/2016 13:01
e       18/01/2016 12:01        y       18/01/2016 13:01
f       18/01/2016 12:01        z       18/01/2016 13:01
g       18/01/2016 12:01        g       18/01/2016 13:01
h       18/01/2016 12:01        h       18/01/2016 13:01
i       18/01/2016 12:01        i       18/01/2016 13:01

获取文本总数：

SELECT *, COUNT(*) AS total FROM table 
WHERE DAY(date) = DAY('2016-01-18') 
AND MONTH(date) = MONTH('2016-01-18') 
AND YEAR(date) = YEAR('2016-01-18') 
GROUP BY text ORDER BY total DESC

结果：

a   2
b   2
c   2
d   1
e   1
f   1
g   1
h   1
i   1
x   1
y   1
z   1

我的问题是，我只想每小时使用前5个数据，并希望得到如下结果：

data : 
a       18/01/2016 12:01        a       18/01/2016 13:01
b       18/01/2016 12:01        b       18/01/2016 13:01
c       18/01/2016 12:01        c       18/01/2016 13:01
d       18/01/2016 12:01        x       18/01/2016 13:01
e       18/01/2016 12:01        y       18/01/2016 13:01

result :
a   2
b   2
c   2
d   1
e   1
x   1
y   1

Answer 1

下面显示的查询将给出所需的结果

SELECT text, max(date) as maxdate, COUNT(*) AS total 
FROM table 
WHERE 
DAY(date) = DAY('2016-01-18') 
AND MONTH(date) = MONTH('2016-01-18') 
AND YEAR(date) = YEAR('2016-01-18') 
GROUP BY text ORDER BY maxdate DESC

我希望这会有所帮助。

Answer 2

使用Mysql Limit很简单，你可以使用＆＃34; LIMIT 5＆＃34;，在你的情况下你的代码就像

SELECT *, COUNT(*) AS total FROM table 
WHERE DAY(date) = DAY('2016-01-18') 
AND MONTH(date) = MONTH('2016-01-18') 
AND YEAR(date) = YEAR('2016-01-18') 
GROUP BY text ORDER BY total DESC LIMIT 5

它应该只返回前5个结果。