php - 如何使用多个连接从不同的表中选择总和和计数

Question

我需要从许多表中生成一些关于过滤器的大数据，在那里我还需要获取一些列的总和，以及像示例这样的行数

我有 5 条记录

身份证 | 姓名 | 已删除

1 | 一个 | 1
2 | 一个 | 0
3 | 一个 | 1
4 | 乙| 1
5 | C | 1

我有疑问，

SELECT  p.name, sum(p.deleted) as del, count(p.id) as numbers from products as p
join other AS b ON p.id=b.id

我需要的输出是，

The sum of deleted records

姓名 | 删除 | 数数

一个 | 2 | 3
乙 | 1 | 1
℃ | 1 | 1

score 2 · Accepted Answer

试试这个：：

SELECT  
p.name, 
sum(p.deleted) as del, 
count(id)  as numbers
from products as p
join other AS b ON p.id=b.id 
group by p.name

score 1 · Accepted Answer

您无需加入即可获得结果。这应该有效：

SELECT name, sum(deleted), count(1)
FROM products
GROUP BY name

score 1 · Accepted Answer

SELECT  name,
        SUM(CASE WHEN deleted = 1 THEN 1 ELSE 0 END) Deletion,
        COUNT(*) `COunt`
FROM    products 
GROUP BY name

或者

SELECT  name,
        SUM(deleted) Deletion,
        COUNT(*) `COunt`
FROM    products 
GROUP BY name;

3 回答 3