Question

我需要按照json格式按年份（12个月）打印Total（count）新闻档案，如下所示：

输出：

["January:31","February:28","March:0","April:130","May:450","June:0","July:0","August:0","September:0","October:520","November:20","December:31"]

PHP代码：

SELECT COUNT(*) AS id,
YEAR(date) as `year`,
MONTH(date) as `month`,
MONTHNAME(date) as `month_name`,
FROM `aticle`
GROUP BY `year`, `month`;

注意： if we dont have news in any month print:0 即："March:0","July:0".....

我该如何打印？！

Answer 1

您可以通过为每个月/年组合生成一行来实现此目的。假设每个月和每年至少有一个值，最简单的方法是：

SELECT COUNT(*) AS id, y.yr, m.mon, m.mname
FROM (select distinct year(date) as yr from article) y cross join
     (select distinct month(date) as mon, monthname(date) as mname from article) m left join
     article a
     on year(a.date) = y.yr and month(a.date) = m.mon
GROUP BY y.yr, m.mon;

否则，你必须找到一种方法来获取所有月份的列表，使用类似的东西：

select 1 as mon, 'Jan' as mname union all
. . .

Answer 2

您可以使用IFNULL检查是否找不到数据0 ..

请尝试以下查询。

SELECT IFNULL(COUNT(*),0) AS id, YEAR(date) as `year`, MONTH(date) as `month`, MONTHNAME(date) as `month_name`,FROM `aticle`GROUP BY `year`, `month`;

感谢

PHP MySql：打印每月存档的总数

2 个答案: