Question

我有这样的表格宽度结构：

record  | color| status
--------------------
record1 | blue | x
record1 | blue | y
record2 | red | x
record3 | yellow  | y

我想按照“颜色”计算记录分组。并为每一个计数＆＃39; x＆＃39;和＆＃39;。我想得到这样的结果：

color = blue ，数量= 2 ，x = 1 ，y = 1 color = 红色，数量= 1 ，x = 1 ，y = 0 color = 黄色，数量= 1 ，x = 0 ，y = 1

我的查询：

SELECT color as clr,
       count(record) as cnt
FROM table
WHERE status IN (x, y)
GROUP BY  week(color)

我在php中打印结果如下：

while ($row= mysql_fetch_assoc($query)){
     echo "color=".$row['clr'].", quantity=".$row['cnt'].", x=".$row['cnt'][0].", y=".$row['cnt'][1];
}

所以问题是我在php中打印结果的方法不起作用。

Answer 1

试试这个

查询：

   SELECT color,
   count(color) as quantity,
   LENGTH(GROUP_CONCAT(status)) - LENGTH(REPLACE(GROUP_CONCAT(status), 'x', '')) as 'x',
   LENGTH(GROUP_CONCAT(status)) - LENGTH(REPLACE(GROUP_CONCAT(status), 'y', '')) as 'y'
   FROM table 
   WHERE status IN('x','y')
   GROUP BY color

PHP：

   while ($row= mysql_fetch_assoc($query)){
     echo "color=".$row['color'].", quantity=".$row['quantity'].",x=".$row['x'].", y=".$row['y'];
   }

Answer 2

使用条件聚合：

select color,
       count(*) as quantity,
       sum(status = 'x') as x,
       sum(status = 'y') as y
from t
group by color;

sql - 具有多个WHERE条件的计数

2 个答案: