如何選擇總和，並使用多個連接從不同表格中計數

Question

我需要從許多表中生成一些大數據，關於過濾器，在那裏我還需要獲取某些列的總和以及像例子那樣的行數

我有5條記錄

ID | NAME |刪除

1 | A | 1
2 | A | 0
3 | A | 1
4 | B | 1
5 | C | 1

我有查詢，

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 

輸出我需要的是，

The sum of deleted records 

名稱|刪除|計數

A | 2 | 3
B | 1 | 1
C | 1 | 1

Answer 1

試試這個::

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 

Answer 2

你不應該需要加入，讓您的結果。這應該工作：

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

Answer 3

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

OR

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

• SQLFiddle Demo (both queries)